Alkali metal
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The alkali metals consist of the chemical elements lithium, sodium, potassium, rubidium, caesium, and francium. Together with hydrogen they constitute group 1, which lies in the s-block of the periodi
Petalite, the lithium mineral from which lithium was first isolated
Johann Wolfgang Döbereiner was among the first to notice similarities between what are now known as the alkali metals.
Lepidolite, the rubidium mineral from which rubidium was first isolated
Spodumene, an important lithium mineral
Alkaline earth metal
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The alkaline earth metals are six chemical elements in group 2 of the periodic table. They are beryllium, magnesium, calcium, strontium, barium, and radium. The elements have very similar properties:
Alkali metal
…the alkali metals have odd atomic numbers and they are not as common as the elements with even atomic numbers adjacent to them (the noble gases and the alkaline earth metals) in the Solar System. The heavier alkali metals are also less abundant than the lighter ones as the alkali metals from rubidium onward can only be…
Emerald is a form of beryl, the principal mineral of beryllium.
Barite, the material that was first found to contain barium.
Series of alkaline earth metals.
Emerald, colored green with trace amounts of chromium, is a variety of the mineral beryl which is beryllium aluminum silicate.