13
Al
aluminium
aluminum
26.982

General properties

Group
group 13
Period
period 3
Category
post-transition metals
Standard atomic weight
26.981 5384(3)
Melting point
933.47 K (660.32 °C)
Boiling point
2743 K (2470 °C)
Phase at STP
solid

Additional properties

Block
p-block
Electron configuration
[Ne] 3s² 3p¹
Electrons per shell
2, 8, 3
Electronegativity
1.61
Density
2.70 g/cm³
Oxidation states
−2, −1, +1, +2, +3 (an amphoteric oxide)
CAS Number
7429-90-5