4
Be
beryllium
9.0122

General properties

Group
group 2 (alkaline metals)
Period
period 2
Category
alkaline earth metals
Standard atomic weight
9.012 1831(5)
Melting point
1560 K (1287 °C)
Boiling point
2742 K (2469 °C)
Phase at STP
solid

Additional properties

Block
s-block
Electron configuration
[He] 2s²
Electrons per shell
2, 2
Electronegativity
1.57
Density
1.85 g/cm³
Oxidation states
0, +1, +2 (an amphoteric oxide)
CAS Number
7440-41-7