Old English, or Anglo-Saxon, is the earliest historical form of the English language, spoken in England and southern and eastern Scotland in the early Middle Ages. It was brought to Great Britain by Anglo-Saxon settlers in the mid-5th century, the first Old English literary works date from the mid-7th century. After the Norman conquest of 1066, English was replaced, for a time, as the language of the upper classes by Anglo-Norman, a relative of French; this is regarded as marking the end of the Old English era, as during this period the English language was influenced by Anglo-Norman, developing into a phase known now as Middle English. Old English developed from a set of Anglo-Frisian or Ingvaeonic dialects spoken by Germanic tribes traditionally known as the Angles and Jutes; as the Anglo-Saxons became dominant in England, their language replaced the languages of Roman Britain: Common Brittonic, a Celtic language, Latin, brought to Britain by Roman invasion. Old English had four main dialects, associated with particular Anglo-Saxon kingdoms: Mercian, Northumbrian and West Saxon.
It was West Saxon that formed the basis for the literary standard of the Old English period, although the dominant forms of Middle and Modern English would develop from Mercian. The speech of eastern and northern parts of England was subject to strong Old Norse influence due to Scandinavian rule and settlement beginning in the 9th century. Old English is one of the West Germanic languages, its closest relatives are Old Frisian and Old Saxon. Like other old Germanic languages, it is different from Modern English and difficult for Modern English speakers to understand without study. Old English grammar is similar to that of modern German: nouns, adjectives and verbs have many inflectional endings and forms, word order is much freer; the oldest Old English inscriptions were written using a runic system, but from about the 9th century this was replaced by a version of the Latin alphabet. Englisc, which the term English is derived from, means'pertaining to the Angles'. In Old English, this word was derived from Angles.
During the 9th century, all invading Germanic tribes were referred to as Englisc. It has been hypothesised that the Angles acquired their name because their land on the coast of Jutland resembled a fishhook. Proto-Germanic *anguz had the meaning of'narrow', referring to the shallow waters near the coast; that word goes back to Proto-Indo-European *h₂enǵʰ- meaning'narrow'. Another theory is that the derivation of'narrow' is the more connection to angling, which itself stems from a Proto-Indo-European root meaning bend, angle; the semantic link is the fishing hook, curved or bent at an angle. In any case, the Angles may have been called such because they were a fishing people or were descended from such, therefore England would mean'land of the fishermen', English would be'the fishermen's language'. Old English was not static, its usage covered a period of 700 years, from the Anglo-Saxon settlement of Britain in the 5th century to the late 11th century, some time after the Norman invasion. While indicating that the establishment of dates is an arbitrary process, Albert Baugh dates Old English from 450 to 1150, a period of full inflections, a synthetic language.
Around 85 per cent of Old English words are no longer in use, but those that survived are basic elements of Modern English vocabulary. Old English is a West Germanic language, it came to be spoken over most of the territory of the Anglo-Saxon kingdoms which became the Kingdom of England. This included most of present-day England, as well as part of what is now southeastern Scotland, which for several centuries belonged to the Anglo-Saxon kingdom of Northumbria. Other parts of the island – Wales and most of Scotland – continued to use Celtic languages, except in the areas of Scandinavian settlements where Old Norse was spoken. Celtic speech remained established in certain parts of England: Medieval Cornish was spoken all over Cornwall and in adjacent parts of Devon, while Cumbric survived to the 12th century in parts of Cumbria, Welsh may have been spoken on the English side of the Anglo-Welsh border. Norse was widely spoken in the parts of England which fell under Danish law. Anglo-Saxon literacy developed after Christianisation in the late 7th century.
The oldest surviving text of Old English literature is Cædmon's Hymn, composed between 658 and 680. There is a limited corpus of runic inscriptions from the 5th to 7th centuries, but the oldest coherent runic texts date to the 8th century; the Old English Latin alphabet was introduced around the 9th century. With the unification of the Anglo-Saxon kingdoms by Alfred the Great in the 9th century, the language of government and literature became standardised around the West Saxon dialect. Alfred advocated education in English alongside Latin, had many works translated into the English language. In Old English, typical of the development of literature, poetry arose before prose, but King Alfred the Great chiefly inspired the growth of prose. A literary standard, dating from the 10th century, arose under the influence of Bishop Æthelwold of Winchester, was followed by such writers as the prolific Ælfric of Eynsham. Th
Nickel is a chemical element with symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel is hard and ductile. Pure nickel, powdered to maximize the reactive surface area, shows a significant chemical activity, but larger pieces are slow to react with air under standard conditions because an oxide layer forms on the surface and prevents further corrosion. So, pure native nickel is found in Earth's crust only in tiny amounts in ultramafic rocks, in the interiors of larger nickel–iron meteorites that were not exposed to oxygen when outside Earth's atmosphere. Meteoric nickel is found in combination with iron, a reflection of the origin of those elements as major end products of supernova nucleosynthesis. An iron–nickel mixture is thought to compose Earth's outer and inner cores. Use of nickel has been traced as far back as 3500 BCE. Nickel was first isolated and classified as a chemical element in 1751 by Axel Fredrik Cronstedt, who mistook the ore for a copper mineral, in the cobalt mines of Los, Hälsingland, Sweden.
The element's name comes from a mischievous sprite of German miner mythology, who personified the fact that copper-nickel ores resisted refinement into copper. An economically important source of nickel is the iron ore limonite, which contains 1–2% nickel. Nickel's other important ore minerals include pentlandite and a mixture of Ni-rich natural silicates known as garnierite. Major production sites include the Sudbury region in Canada, New Caledonia in the Pacific, Norilsk in Russia. Nickel is oxidized by air at room temperature and is considered corrosion-resistant, it has been used for plating iron and brass, coating chemistry equipment, manufacturing certain alloys that retain a high silvery polish, such as German silver. About 9% of world nickel production is still used for corrosion-resistant nickel plating. Nickel-plated objects sometimes provoke nickel allergy. Nickel has been used in coins, though its rising price has led to some replacement with cheaper metals in recent years. Nickel is one of four elements that are ferromagnetic at room temperature.
Alnico permanent magnets based on nickel are of intermediate strength between iron-based permanent magnets and rare-earth magnets. The metal is valuable in modern times chiefly in alloys. A further 10% is used for nickel-based and copper-based alloys, 7% for alloy steels, 3% in foundries, 9% in plating and 4% in other applications, including the fast-growing battery sector; as a compound, nickel has a number of niche chemical manufacturing uses, such as a catalyst for hydrogenation, cathodes for batteries and metal surface treatments. Nickel is an essential nutrient for some microorganisms and plants that have enzymes with nickel as an active site. Nickel is a silvery-white metal with a slight golden tinge, it is one of only four elements that are magnetic at or near room temperature, the others being iron and gadolinium. Its Curie temperature is 355 °C; the unit cell of nickel is a face-centered cube with the lattice parameter of 0.352 nm, giving an atomic radius of 0.124 nm. This crystal structure is stable to pressures of at least 70 GPa.
Nickel belongs to the transition metals. It is hard and ductile, has a high for transition metals electrical and thermal conductivity; the high compressive strength of 34 GPa, predicted for ideal crystals, is never obtained in the real bulk material due to the formation and movement of dislocations. The nickel atom has two electron configurations, 3d8 4s2 and 3d9 4s1, which are close in energy – the symbol refers to the argon-like core structure. There is some disagreement. Chemistry textbooks quote the electron configuration of nickel as 4s2 3d8, which can be written 3d8 4s2; this configuration agrees with the Madelung energy ordering rule, which predicts that 4s is filled before 3d. It is supported by the experimental fact that the lowest energy state of the nickel atom is a 3d8 4s2 energy level the 3d8 4s2 3F, J = 4 level. However, each of these two configurations splits into several energy levels due to fine structure, the two sets of energy levels overlap; the average energy of states with configuration 3d9 4s1 is lower than the average energy of states with configuration 3d8 4s2.
For this reason, the research literature on atomic calculations quotes the ground state configuration of nickel as 3d9 4s1. The isotopes of nickel range in atomic weight from 48 u to 78 u. Occurring nickel is composed of five stable isotopes. Isotopes heavier than 62Ni cannot be formed by nuclear fusion without losing energy. Nickel-62 has the highest mean nuclear binding energy per nucleon of any nuclide, at 8.7946 MeV/nucleon. Its binding energy is greater than both 56Fe and 58Fe, more abundant elements incorrectly cited as having the most tightly-bound nuclides. Although this would seem to predict nickel-62 as the most abundant heavy element in the universe, the high rate of photodisintegration of nickel in stellar interiors causes iron to be by far the most abundant. Stable isotope nickel-60 is the daughter product of the extinct radionuclide 60Fe, whi
The shilling is a unit of currency used in Austria, the United Kingdom, New Zealand, United States and other British Commonwealth countries. The shilling is used as a currency in four east African countries: Kenya, Tanzania and Somalia, it is the proposed currency that the east African community plans to introduce. The word shilling comes from old English "Scilling", a monetary term meaning twentieth of a pound, from the Proto-Germanic root skiljaną meaning'to separate, divide.' The word "Scilling" is mentioned in the earliest recorded Germanic law codes, those of Æthelberht of Kent. Slang terms for the old shilling coins include "bob" and "hog". While the derivation of "bob" is uncertain, John Camden Hotten in his 1864 Slang Dictionary says the original version was "bobstick" and speculates that it may be connected with Sir Robert Walpole. One abbreviation for shilling is s, it was represented by a solidus symbol, which may have stood for a long s or ſ, thus 1/9 would be one shilling and ninepence.
A price with no pence was sometimes written with a solidus and a dash: 11/–. The solidus symbol is still used for the Kenyan shilling, rather than sh. During the Great Recoinage of 1816, the mint was instructed to coin one troy pound of standard silver into 66 shillings, or its equivalent in other denominations; this set the weight of the shilling, its subsequent decimal replacement 5 new pence coin, at 87.2727 grains or 5.655 grams from 1816 until 1990, when a new smaller 5p coin was introduced. In the past, the English world has had various myths about the shilling. One myth was that it was deemed to be the value of a cow in a sheep elsewhere. A shilling was a coin used in England from the reign of Henry VII; the shilling continued in use after the Acts of Union of 1707 created a new United Kingdom from the Kingdoms of England and Scotland, under Article 16 of the Articles of Union, a common currency for the new United Kingdom was created. The term shilling was in use in Scotland from early medieval times.
The common currency created in 1707 by Article 16 of the Articles of Union continued in use until decimalisation in 1971. In the traditional pounds and pence system, there were 20 shillings per pound and 12 pence per shilling, thus there were 240 pence in a pound. Three coins denominated in multiple shillings were in circulation at this time, they were: two shillings, which adopted the value of 10 new pence at decimalisation. At decimalisation in 1971, the shilling coin was superseded by the new five-pence piece, of identical size and weight and had the same value, inherited the shilling's slang name of a bob. Shillings remained in circulation until the five pence coin was reduced in size in 1991. Between 1701 and the unification of the currencies in 1825, the Irish shilling was valued at 13 pence and known as the "black hog", as opposed to the 12-pence English shillings which were known as "white hogs". In the Irish Free State and Republic of Ireland the shilling coin was issued as scilling in Irish.
It was worth 1/20th of an Irish pound, was interchangeable at the same value to the British coin, which continued to be used in Northern Ireland. The coin featured a bull on the reverse side; the first minting, from 1928 until 1941, contained 75% silver, more than the equivalent British coin. The original Irish shilling coin ) was withdrawn from circulation on 1 January 1993, when a smaller five pence coin was introduced. Australian shillings, twenty of which made up one Australian pound, were first issued in 1910, with the Australian coat of arms on the reverse and King Edward VII on the face; the coat of arms design was retained through the reign of King George V until a new ram's head design was introduced for the coins of King George VI. This design continued until the last year of issue in 1963. In 1966, Australia's currency was decimalised and the shilling was replaced by a ten cent coin, where 10 shillings made up one Australian dollar; the slang term for a shilling coin in Australia was "deener".
The slang term for a shilling as currency unit was "bob", the same as in the United Kingdom. After 1966, shillings continued to circulate, as they were replaced by 10-cent coins of the same size and weight. New Zealand shillings, twenty of which made up one New Zealand pound, were first issued in 1933 and featured the image of a Maori warrior carrying a taiaha "in a warlike attitude" on the reverse. In 1967, New Zealand's currency was decimalised and the shilling was replaced by a ten cent coin of the same size and weight. Ten cent coins minted through the remainder of the 1960s included the legend "ONE SHILLING" on the reverse. Smaller 10-cent coins were introduced in 2006. Shillings were used in Malta, prior to decimalisation in 1972, had a face value of five Maltese cents. In British Ceylon, an shilling was equivalent to eight fanams. With the replacement of the rixdollar by the rupee in 1852, a shilling was deemed to be equivalent to half a rupee. On the decimalisation of the currency
Silver is a chemical element with symbol Ag and atomic number 47. A soft, lustrous transition metal, it exhibits the highest electrical conductivity, thermal conductivity, reflectivity of any metal; the metal is found in the Earth's crust in the pure, free elemental form, as an alloy with gold and other metals, in minerals such as argentite and chlorargyrite. Most silver is produced as a byproduct of copper, gold and zinc refining. Silver has long been valued as a precious metal. Silver metal is used in many bullion coins, sometimes alongside gold: while it is more abundant than gold, it is much less abundant as a native metal, its purity is measured on a per-mille basis. As one of the seven metals of antiquity, silver has had an enduring role in most human cultures. Other than in currency and as an investment medium, silver is used in solar panels, water filtration, ornaments, high-value tableware and utensils, in electrical contacts and conductors, in specialized mirrors, window coatings, in catalysis of chemical reactions, as a colorant in stained glass and in specialised confectionery.
Its compounds are used in X-ray film. Dilute solutions of silver nitrate and other silver compounds are used as disinfectants and microbiocides, added to bandages and wound-dressings and other medical instruments. Silver is similar in its physical and chemical properties to its two vertical neighbours in group 11 of the periodic table and gold, its 47 electrons are arranged in the configuration 4d105s1 to copper and gold. This distinctive electron configuration, with a single electron in the highest occupied s subshell over a filled d subshell, accounts for many of the singular properties of metallic silver. Silver is an soft and malleable transition metal, though it is less malleable than gold. Silver crystallizes in a face-centered cubic lattice with bulk coordination number 12, where only the single 5s electron is delocalized to copper and gold. Unlike metals with incomplete d-shells, metallic bonds in silver are lacking a covalent character and are weak; this observation explains the low high ductility of single crystals of silver.
Silver has a brilliant white metallic luster that can take a high polish, and, so characteristic that the name of the metal itself has become a colour name. Unlike copper and gold, the energy required to excite an electron from the filled d band to the s-p conduction band in silver is large enough that it no longer corresponds to absorption in the visible region of the spectrum, but rather in the ultraviolet. Protected silver has greater optical reflectivity than aluminium at all wavelengths longer than ~450 nm. At wavelengths shorter than 450 nm, silver's reflectivity is inferior to that of aluminium and drops to zero near 310 nm. High electrical and thermal conductivity is common to the elements in group 11, because their single s electron is free and does not interact with the filled d subshell, as such interactions lower electron mobility; the electrical conductivity of silver is the greatest of all metals, greater than copper, but it is not used for this property because of the higher cost.
An exception is in radio-frequency engineering at VHF and higher frequencies where silver plating improves electrical conductivity because those currents tend to flow on the surface of conductors rather than through the interior. During World War II in the US, 13540 tons of silver were used in electromagnets for enriching uranium because of the wartime shortage of copper. Pure silver has the highest thermal conductivity of any metal, although the conductivity of carbon and superfluid helium-4 are higher. Silver has the lowest contact resistance of any metal. Silver forms alloys with copper and gold, as well as zinc. Zinc-silver alloys with low zinc concentration may be considered as face-centred cubic solid solutions of zinc in silver, as the structure of the silver is unchanged while the electron concentration rises as more zinc is added. Increasing the electron concentration further leads to body-centred cubic, complex cubic, hexagonal close-packed phases. Occurring silver is composed of two stable isotopes, 107Ag and 109Ag, with 107Ag being more abundant.
This equal abundance is rare in the periodic table. The atomic weight is 107.8682 u. Both isotopes of silver are produced in stars via the s-process, as well as in supernovas via the r-process. Twenty-eight radioisotopes have been characterized, the most stable being 105Ag with a half-life of 41.29 days, 111Ag with a half-life of 7.45 days, 112Ag with a half-life of 3.13 hours. Silver has numerous nuclear isomers, the most stable being 108mAg, 110mAg and 106mAg. All of the remaining radioactive isotopes have half-lives of less than an hour, the majority of these have half-lives of less than three minutes. Isotopes of silver range in relative atomic mass from 92.950 u
Italy the Italian Republic, is a country in Southern Europe. Located in the middle of the Mediterranean Sea, Italy shares open land borders with France, Austria and the enclaved microstates San Marino and Vatican City. Italy covers an area of 301,340 km2 and has a temperate seasonal and Mediterranean climate. With around 61 million inhabitants, it is the fourth-most populous EU member state and the most populous country in Southern Europe. Due to its central geographic location in Southern Europe and the Mediterranean, Italy has been home to a myriad of peoples and cultures. In addition to the various ancient peoples dispersed throughout modern-day Italy, the most famous of which being the Indo-European Italics who gave the peninsula its name, beginning from the classical era and Carthaginians founded colonies in insular Italy and Genoa, Greeks established settlements in the so-called Magna Graecia, while Etruscans and Celts inhabited central and northern Italy respectively; the Italic tribe known as the Latins formed the Roman Kingdom in the 8th century BC, which became a republic with a government of the Senate and the People.
The Roman Republic conquered and assimilated its neighbours on the peninsula, in some cases through the establishment of federations, the Republic expanded and conquered parts of Europe, North Africa and the Middle East. By the first century BC, the Roman Empire emerged as the dominant power in the Mediterranean Basin and became the leading cultural and religious centre of Western civilisation, inaugurating the Pax Romana, a period of more than 200 years during which Italy's technology, economy and literature flourished. Italy remained the metropole of the Roman Empire; the legacy of the Roman Empire endured its fall and can be observed in the global distribution of culture, governments and the Latin script. During the Early Middle Ages, Italy endured sociopolitical collapse and barbarian invasions, but by the 11th century, numerous rival city-states and maritime republics in the northern and central regions of Italy, rose to great prosperity through shipping and banking, laying the groundwork for modern capitalism.
These independent statelets served as Europe's main trading hubs with Asia and the Near East enjoying a greater degree of democracy than the larger feudal monarchies that were consolidating throughout Europe. The Renaissance began in Italy and spread to the rest of Europe, bringing a renewed interest in humanism, science and art. Italian culture flourished, producing famous scholars and polymaths such as Michelangelo, Leonardo da Vinci, Raphael and Machiavelli. During the Middle Ages, Italian explorers such as Marco Polo, Christopher Columbus, Amerigo Vespucci, John Cabot and Giovanni da Verrazzano discovered new routes to the Far East and the New World, helping to usher in the European Age of Discovery. Italy's commercial and political power waned with the opening of trade routes that bypassed the Mediterranean. Centuries of infighting between the Italian city-states, such as the Italian Wars of the 15th and 16th centuries, left the region fragmented, it was subsequently conquered and further divided by European powers such as France and Austria.
By the mid-19th century, rising Italian nationalism and calls for independence from foreign control led to a period of revolutionary political upheaval. After centuries of foreign domination and political division, Italy was entirely unified in 1871, establishing the Kingdom of Italy as a great power. From the late 19th century to the early 20th century, Italy industrialised, namely in the north, acquired a colonial empire, while the south remained impoverished and excluded from industrialisation, fuelling a large and influential diaspora. Despite being one of the main victors in World War I, Italy entered a period of economic crisis and social turmoil, leading to the rise of a fascist dictatorship in 1922. Participation in World War II on the Axis side ended in military defeat, economic destruction and the Italian Civil War. Following the liberation of Italy and the rise of the resistance, the country abolished the monarchy, reinstated democracy, enjoyed a prolonged economic boom and, despite periods of sociopolitical turmoil became a developed country.
Today, Italy is considered to be one of the world's most culturally and economically advanced countries, with the sixth-largest worldwide national wealth. Its advanced economy ranks eighth-largest in the world and third in the Eurozone by nominal GDP. Italy owns the third-largest central bank gold reserve, it has a high level of human development, it stands among the top countries for life expectancy. The country plays a prominent role in regional and global economic, military and diplomatic affairs. Italy is a founding and leading member of the European Union and a member of numerous international institutions, including the UN, NATO, the OECD, the OSCE, the WTO, the G7, the G20, the Union for the Mediterranean, the Council of Europe, Uniting for Consensus, the Schengen Area and many more; as a reflection
Henry VII of England
Henry VII was the King of England and Lord of Ireland from his seizure of the crown on 22 August 1485 to his death on 21 April 1509. He was the first monarch of the House of Tudor. Henry attained the throne when his forces defeated King Richard III at the Battle of Bosworth Field, the culmination of the Wars of the Roses, he was the last king of England to win his throne on the field of battle. He cemented his claim by marrying Elizabeth of York, daughter of Edward IV and niece of Richard III. Henry was successful in restoring the power and stability of the English monarchy after the civil war, his supportive stance of the British Isles' wool industry and his standoff with the Low Countries had long-lasting benefits to all of the British economy. However, the capriciousness and lack of due process that indebted many would tarnish his legacy and were soon ended upon Henry VII's death, after a commission revealed widespread abuses. According to the contemporary historian Polydore Vergil, simple "greed" underscored the means by which royal control was over-asserted in Henry's final years.
Henry can be credited with a number of administrative and diplomatic initiatives. He paid close attention to detail, instead of spending lavishly he concentrated on raising new revenues and after a reign of nearly 24 years, he was peacefully succeeded by his son, Henry VIII; the new taxes were unpopular and two days after his coronation, Henry VIII arrested his father's two most unpopular ministers, Sir Richard Empson and Edmund Dudley. They were charged with high treason and were executed in 1510. Henry VII was born at Pembroke Castle on 28 January 1457 to Countess of Richmond, his father, Edmund Tudor, 1st Earl of Richmond, died three months before his birth. Henry's paternal grandfather, Owen Tudor from the Tudors of Penmynydd, Isle of Anglesey in Wales, had been a page in the court of Henry V, he rose to become one of the "Squires to the Body to the King" after military service at the Battle of Agincourt. Owen is said to have secretly married the widow of Catherine of Valois. One of their sons was Edmund Tudor, father of Henry VII.
Edmund was created Earl of Richmond in 1452, "formally declared legitimate by Parliament". Henry's main claim to the English throne derived from his mother through the House of Beaufort. Henry's mother, Lady Margaret Beaufort, was a great-granddaughter of John of Gaunt, Duke of Lancaster, fourth son of Edward III, his third wife Katherine Swynford. Katherine was Gaunt's mistress for about 25 years, thus Henry's claim was somewhat tenuous: it was from a woman, by illegitimate descent. In theory, the Portuguese and Castilian royal families had a better claim as descendants of Catherine of Lancaster, the daughter of John of Gaunt and his second wife Constance of Castile. Gaunt's nephew Richard II legitimised Gaunt's children by Katherine Swynford by Letters Patent in 1397. In 1407, Henry IV, Gaunt's son by his first wife, issued new Letters Patent confirming the legitimacy of his half-siblings, but declaring them ineligible for the throne. Henry IV's action was of doubtful legality, as the Beauforts were legitimised by an Act of Parliament, but it further weakened Henry's claim.
Nonetheless, by 1483 Henry was the senior male Lancastrian claimant remaining, after the deaths in battle or by murder or execution of Henry VI, his son Edward of Westminster, Prince of Wales, the other Beaufort line of descent through Lady Margaret's uncle, the 2nd Duke of Somerset. Henry made some political capital out of his Welsh ancestry, for example in attracting military support and safeguarding his army's passage through Wales on its way to the Battle of Bosworth, he came from an old, established Anglesey family that claimed descent from Cadwaladr, on occasion Henry displayed the red dragon of Cadwaladr. He took it, as well as the standard of St George, on his procession through London after the victory at Bosworth. A contemporary writer and Henry's biographer, Bernard André made much of Henry's Welsh descent. In reality, his hereditary connections to Welsh aristocracy were not strong, he was descended by the paternal line, through several generations, from Ednyfed Fychan, the seneschal of Gwynedd and through this seneschal's wife from Rhys ap Tewdwr, the King of Deheubarth in South Wales.
His more immediate ancestor, Tudur ap Goronwy, had aristocratic land rights, but his sons, who were first cousins to Owain Glyndŵr, sided with Owain in his revolt. One son was executed and the family land was forfeited. Another son, Henry's great-grandfather, became a butler to the Bishop of Bangor. Owen Tudor, the son of the butler, like the children of other rebels, was provided for by Henry V, a circumstance that precipitated his access to Queen Catherine of Valois. Notwithstanding this lineage, to the bards of Wales, Henry was a candidate for Y Mab Darogan – "The Son of Prophecy" who would free the Welsh from oppression. In 1456, Henry's father Edmund Tudor was captured while fighting for Henry VI in South Wales against the Yorkists, he died in three months before Henry was born. Henry's uncle Jasper Tudor, the Earl of Pembroke and Edmund's younger brother, undertook to protect the young widow, 13 years old when she gave birth to Henry; when Edward IV became King in 1461, Jasper Tudor went into exile abroad.
Pembroke Castle, the Earldom of Pembroke, were granted to the Yorkist William Herbert, who assumed the guardianship of Margaret Beaufort and the young Henry. Henry lived in the Herbert household
Copper is a chemical element with symbol Cu and atomic number 29. It is a soft and ductile metal with high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkish-orange color. Copper is used as a conductor of heat and electricity, as a building material, as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins, constantan used in strain gauges and thermocouples for temperature measurement. Copper is one of the few metals; this led to early human use in several regions, from c. 8000 BC. Thousands of years it was the first metal to be smelted from sulfide ores, c. 5000 BC, the first metal to be cast into a shape in a mold, c. 4000 BC and the first metal to be purposefully alloyed with another metal, tin, to create bronze, c. 3500 BC. In the Roman era, copper was principally mined on Cyprus, the origin of the name of the metal, from aes сyprium corrupted to сuprum, from which the words derived and copper, first used around 1530.
The encountered compounds are copper salts, which impart blue or green colors to such minerals as azurite and turquoise, have been used and as pigments. Copper used in buildings for roofing, oxidizes to form a green verdigris. Copper is sometimes used in decorative art, both in its elemental metal form and in compounds as pigments. Copper compounds are used as bacteriostatic agents and wood preservatives. Copper is essential to all living organisms as a trace dietary mineral because it is a key constituent of the respiratory enzyme complex cytochrome c oxidase. In molluscs and crustaceans, copper is a constituent of the blood pigment hemocyanin, replaced by the iron-complexed hemoglobin in fish and other vertebrates. In humans, copper is found in the liver and bone; the adult body contains between 2.1 mg of copper per kilogram of body weight. Copper and gold are in group 11 of the periodic table; the filled d-shells in these elements contribute little to interatomic interactions, which are dominated by the s-electrons through metallic bonds.
Unlike metals with incomplete d-shells, metallic bonds in copper are lacking a covalent character and are weak. This observation explains the low high ductility of single crystals of copper. At the macroscopic scale, introduction of extended defects to the crystal lattice, such as grain boundaries, hinders flow of the material under applied stress, thereby increasing its hardness. For this reason, copper is supplied in a fine-grained polycrystalline form, which has greater strength than monocrystalline forms; the softness of copper explains its high electrical conductivity and high thermal conductivity, second highest among pure metals at room temperature. This is because the resistivity to electron transport in metals at room temperature originates from scattering of electrons on thermal vibrations of the lattice, which are weak in a soft metal; the maximum permissible current density of copper in open air is 3.1×106 A/m2 of cross-sectional area, above which it begins to heat excessively. Copper is one of a few metallic elements with a natural color other than silver.
Pure copper acquires a reddish tarnish when exposed to air. The characteristic color of copper results from the electronic transitions between the filled 3d and half-empty 4s atomic shells – the energy difference between these shells corresponds to orange light; as with other metals, if copper is put in contact with another metal, galvanic corrosion will occur. Copper does not react with water, but it does react with atmospheric oxygen to form a layer of brown-black copper oxide which, unlike the rust that forms on iron in moist air, protects the underlying metal from further corrosion. A green layer of verdigris can be seen on old copper structures, such as the roofing of many older buildings and the Statue of Liberty. Copper tarnishes when exposed to some sulfur compounds, with which it reacts to form various copper sulfides. There are 29 isotopes of copper. 63Cu and 65Cu are stable, with 63Cu comprising 69% of occurring copper. The other isotopes are radioactive, with the most stable being 67Cu with a half-life of 61.83 hours.
Seven metastable isotopes have been characterized. Isotopes with a mass number above 64 decay by β−, whereas those with a mass number below 64 decay by β+. 64Cu, which has a half-life of 12.7 hours, decays both ways.62Cu and 64Cu have significant applications. 62Cu is used in 62Cu-PTSM as a radioactive tracer for positron emission tomography. Copper is produced in massive stars and is present in the Earth's crust in a proportion of about 50 parts per million. In nature, copper occurs in a variety of minerals, including native copper, copper sulfides such as chalcopyrite, digenite and chalcocite, copper sulfosalts such as tetrahedite-tennantite, enargite, copper carbonates such as azurite and malachite, as copper or copper oxides such as cuprite and tenorite, respectively; the largest mass of elemental copper discovered weighed 420 tonnes and was found in 1857 on the Keweenaw Peninsula in Michigan, US. Native copper is a polycrystal