4. Beryllium
Name: Beryllium
Symbol: Be
Atomic Number: 4
Atomic Mass: 9.012182 amu
Melting Point: 1278.0 °C (1551.15 °K, 2332.4 °F)
Boiling Point: 2970.0 °C (3243.15 °K, 5378.0 °F)
Number of Protons/Electrons: 4
Number of Neutrons: 5
Classification: Alkaline Earth
Crystal Structure: Hexagonal
Density(293 K): 1.8477 g/cm3
Color: gray
Beryllium is a Group 2 element. At ordinary temperatures, beryllium resists oxidation in air. Its ability to scratch glass is probably due to the formation of a thin layer of the oxide. Aquamarine and emerald are precious forms of the mineral beryl, [Be3Al2(SiO3)6].
The name beryllium comes from the Greek beryllos, beryl. At one time beryllium was referred to as glucinium (from Greek glykys, sweet), due to the sweet taste of its salts. This element was discovered by Louis Vauquelin in 1798 as the oxide in beryl and in emeralds. Friedrich Wohler and A. A. Bussy independently isolated the metal in 1828 by reacting potassium on beryllium chloride.
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| Alkaline Earth |
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