Beryllium

Alkaline earth metals · Group 2 · Period 2

Atomic properties

Atomic number	4
Symbol	Be
Standard atomic weight	9.0122
Classification	Alkaline earth metals
Group	2
Period	2
Block	s-block
Electron configuration	[He] 2s2
Electronegativity (Pauling)	1.57
Common oxidation states	+2

Physical properties

Phase at 20 °C	Solid
Density	1.85 g/cm³
Melting point	1287 °C
Boiling point	2469 °C
Discovered	1798
CAS number	—

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