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Beryllium (Be)

From Wikipedia, the free encyclopediaBeryllium is a chemical element with symbol Be and atomic number 4. It is created through stellar nucleosynthesis and is a relatively rare element in the universe. It is a divalent element which occurs naturally only in combination with other elements in minerals.

Beryllium in the periodic table

SymbolBe
Atomic number4
Group2
Period2
Blocks
Element categoryAlkaline Earth Metal

Physical properties

Phase at STPSolid
Density1.85 g/cm3
Atomic weight9.01218 u
Melting point1560 K
1286.85 °C
2348.33 °F
Boiling point2742 K
2468.85 °C
4475.93 °F

Atomic properties

Electronegativity (Pauling Scale)1.57
Electron affinity-48 kJ/mol
Oxidation states0, +1, +2
(an amphoteric oxide)
Ionization energies
1899.5 kJ/mol
2 1757.1 kJ/mol
3 14848.7 kJ/mol
4 21006.6 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[He] 2s2
Electron configuration1s2 2s2
Electrons per shell2, 2

History

Discovered1798
Discovered byLouis Nicolas Vauquelin
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