76
Os
190.23
Osmium
Element 76 · 190.23 u · d-block
transition metal
The densest naturally occurring element. Has a pungent toxic oxide. Used in fountain pen tips and electrical contacts.
Phase (STP)
Solid
Melting Point
3033 °C
Boiling Point
5012 °C
Density
22.59 g/cm³
Electronegativity
2.2
Atomic Radius
130 pm
Ionization Energy
840 kJ/mol
Electron Affinity
106 kJ/mol
Discovered
1803 · Smithson Tennant
Electron Configuration
[Xe] 4f14 5d6 6s2
Electron Orbitals
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