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Mercury (element)

Mercury is a chemical element with the symbol Hg and atomic number 80. It is known as quicksilver and was named hydrargyrum. A heavy, silvery d-block element, mercury is the only metallic element, liquid at standard conditions for temperature and pressure. Mercury occurs in deposits throughout the world as cinnabar; the red pigment vermilion is obtained by synthetic mercuric sulfide. Mercury is used in thermometers, manometers, sphygmomanometers, float valves, mercury switches, mercury relays, fluorescent lamps and other devices, though concerns about the element's toxicity have led to mercury thermometers and sphygmomanometers being phased out in clinical environments in favor of alternatives such as alcohol- or galinstan-filled glass thermometers and thermistor- or infrared-based electronic instruments. Mechanical pressure gauges and electronic strain gauge sensors have replaced mercury sphygmomanometers. Mercury remains in use in scientific research applications and in amalgam for dental restoration in some locales.

It is used in fluorescent lighting. Electricity passed through mercury vapor in a fluorescent lamp produces short-wave ultraviolet light, which causes the phosphor in the tube to fluoresce, making visible light. Mercury poisoning can result from exposure to water-soluble forms of mercury, by inhalation of mercury vapor, or by ingesting any form of mercury. Mercury is a silvery-white liquid metal. Compared to other metals, it is a fair conductor of electricity, it has a freezing point of −38.83 °C and a boiling point of 356.73 °C, both the lowest of any stable metal, although preliminary experiments on copernicium and flerovium have indicated that they have lower boiling points. Upon freezing, the volume of mercury decreases by 3.59% and its density changes from 13.69 g/cm3 when liquid to 14.184 g/cm3 when solid. The coefficient of volume expansion is 181.59 × 10−6 at 0 °C, 181.71 × 10−6 at 20 °C and 182.50 × 10−6 at 100 °C. Solid mercury can be cut with a knife. A complete explanation of mercury's extreme volatility delves deep into the realm of quantum physics, but it can be summarized as follows: mercury has a unique electron configuration where electrons fill up all the available 1s, 2s, 2p, 3s, 3p, 3d, 4s, 4p, 4d, 4f, 5s, 5p, 5d, 6s subshells.

Because this configuration resists removal of an electron, mercury behaves to noble gases, which form weak bonds and hence melt at low temperatures. The stability of the 6s shell is due to the presence of a filled 4f shell. An f shell poorly screens the nuclear charge that increases the attractive Coulomb interaction of the 6s shell and the nucleus; the absence of a filled inner f shell is the reason for the somewhat higher melting temperature of cadmium and zinc, although both these metals still melt and, in addition, have unusually low boiling points. Mercury does not react with most acids, such as dilute sulfuric acid, although oxidizing acids such as concentrated sulfuric acid and nitric acid or aqua regia dissolve it to give sulfate and chloride. Like silver, mercury reacts with atmospheric hydrogen sulfide. Mercury reacts with solid sulfur flakes. Mercury dissolves many metals such as silver to form amalgams. Iron is an exception, iron flasks have traditionally been used to trade mercury.

Several other first row transition metals with the exception of manganese and zinc are resistant in forming amalgams. Other elements that do not form amalgams with mercury include platinum. Sodium amalgam is a common reducing agent in organic synthesis, is used in high-pressure sodium lamps. Mercury combines with aluminium to form a mercury-aluminium amalgam when the two pure metals come into contact. Since the amalgam destroys the aluminium oxide layer which protects metallic aluminium from oxidizing in-depth small amounts of mercury can corrode aluminium. For this reason, mercury is not allowed aboard an aircraft under most circumstances because of the risk of it forming an amalgam with exposed aluminium parts in the aircraft. Mercury embrittlement is the most common type of liquid metal embrittlement. There are seven stable isotopes of mercury, with 202Hg being the most abundant; the longest-lived radioisotopes are 194Hg with a half-life of 444 years, 203Hg with a half-life of 46.612 days. Most of the remaining radioisotopes have half-lives.

199Hg and 201Hg are the most studied NMR-active nuclei, having spins of ​1⁄2 and ​3⁄2 respectively. Hg is the modern chemical symbol for mercury, it comes from hydrargyrum, a Latinized form of the Greek word ὑδράργυρος, a compound word meaning "water-silver" – since it is liquid like water and shiny like silver. The element was named after the Roman god Mercury, known for his mobility, it is associated with the planet Mercury. Mercury is the only metal for which the

Minnie Maud

Minnie Maud is the name of a creek and canyon in eastern Utah, noted as the western starting point of the Nine Mile Canyon petroglyphs section. Minnie Maud Creek is a stream whose headwaters begin where the Western Tavaputs and Wasatch Plateau meet the Uinta Mountains; the creek has limited irrigation possibilities. It merges with Nine Mile Creek. Minnie Maud Creek drains into Nine Mile Creek. Minnie Maud Canyon, formed by Minnie Maud Creek is narrow and lacks Fremont Cultural ruins and writings that are abundant in Nine Mile Canyon. Due to its narrow nature, Minnie Maud Canyon was never permanently settled, although a school district that served residents in Nine Mile Canyon was opened in the canyon in 1896 and took the name Minnie Maud. Minnie Maud School District closed in 1898 with only 43 students. John Wesley Powell named the creek for his niece, the pioneering American violin virtuoso Maud Powell. Maud Powell was the daughter of John Wesley Powell's brother Bramwell. List of rivers of Utah Bureau of Land Management, Nine Mile Canyon

2015–16 Kentucky Wildcats women's basketball team

The 2015–16 Kentucky Wildcats women's basketball team will represent University of Kentucky during the 2015–16 NCAA Division I women's basketball season. The Wildcats, led by ninth year head coach Matthew Mitchell, play their home games at the Memorial Coliseum with two games at Rupp Arena and were members of the Southeastern Conference, they finished the season 10 -- 6 in SEC play to finish in a tie for fourth place. They advanced to the semifinals of the SEC Women's Tournament, they received an at-large to the NCAA Women's Tournament where they defeated UNC Asheville and Oklahoma in the first and second rounds before getting upset by Washington the sweet sixteen. 2015–16 Kentucky Wildcats men's basketball team Kentucky Wildcats women's basketball