Periodic Table
76
Os
190.23
Osmium
Transition MetalDensest naturally occurring element; OsO₄ oxidant.
Electronic Configuration
[Xe] 4f¹⁴ 5d⁶ 6s²or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 4f¹⁴ 5d⁶ 6s²
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
32e⁻n=4
14e⁻n=5
2e⁻n=6
Properties
Atomic number
76
Atomic mass
190.23 u
Category
Transition Metal
Block / Group / Period
d · 8 · 6
Valence electrons
2
Oxidation states
+3, +4, +8
Electronegativity
2.2
Atomic radius
185 pm
Ionization energy
840 kJ/mol
Electron affinity
104 kJ/mol
Melting point
3306 K / 3033 °C
Boiling point
5285 K / 5012 °C
Density
22.59 g/cm³
State at 25 °C
solid
Personal Notes
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