89
Ac
actinium
[227]

General properties

Group
n/a
Period
period 7
Category
actinoids
Standard atomic weight
-
Melting point
1500 K (1227 °C)
Boiling point
3500±300 K (3227±300 °C)
Phase at STP
solid

Additional properties

Block
f-block
Electron configuration
[Rn] 6d¹ 7s²
Electrons per shell
2, 8, 18, 32, 18, 9, 2
Electronegativity
1.1
Density
10 g/cm³
Oxidation states
+2, +3 (a strongly basic oxide)
CAS Number
7440-34-8