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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

Atomic number4
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


Discovered byLouis Nicolas Vauquelin
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