90
Th
thorium
232.04

General properties

Group
n/a
Period
period 7
Category
actinoids
Standard atomic weight
232.0377(4)
Melting point
2023 K (1750 °C)
Boiling point
5061 K (4788 °C)
Phase at STP
solid

Additional properties

Block
f-block
Electron configuration
[Rn] 6d² 7s²
Electrons per shell
2, 8, 18, 32, 18, 10, 2
Electronegativity
1.3
Density
11.7 g/cm³
Oxidation states
+1, +2, +3, +4 (a weakly basic oxide)
CAS Number
7440-29-1