76
Os
osmium
190.23

General properties

Group
group 8
Period
period 6
Category
transition metals
Standard atomic weight
190.23(3)
Melting point
3306 K (3033 °C)
Boiling point
5285 K (5012 °C)
Phase at STP
solid

Additional properties

Block
d-block
Electron configuration
[Xe] 4f¹⁴ 5d⁶ 6s²
Electrons per shell
2, 8, 18, 32, 14, 2
Electronegativity
2.2
Density
22.59 g/cm³
Oxidation states
−4, −2, −1, 0, +1, +2, +3, +4, +5, +6, +7, +8 (a mildly oxide)
CAS Number
7440-04-2