Os
Osmium
Z 76 190.23 g/molTransition Metal
Nucleus
76 Protons
114 Neutrons
76 Electrons (8 Valence)
Shell distribution: K2 • L8 • M18 • N32 • O14 • P2 • Q0
Electron Configuration
Energy
7p
6d
5f
7s
6p
5d
4f
6s
5p
4d
5s
4p
3d
4s
3p
3s
2p
2s
1s
[Xe]4f145d66s2
Oxidation States
CommonRare
0
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Radii
Empirical
130 pm1.3 Å
Calculated
185 pm1.85 Å
Covalent
144±4 pm1.44±0.04 Å
Van der Waals
216 pm2.16 Å
IonicOs4+
63 pm0.63 Å
Crystal Structure
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Hexagonal close-packed
Pearson symbol
hP2
Space group
P63/mmc No. 194