76Solid
Os 190.23 Atomic mass · uTransition metals
Osmium
Osmium (from Greek osme (ὀσμή) meaning "smell") is a chemical element with symbol Os and atomic number 76. It is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. Osmium is the densest naturally occurring element, with a density of 22.59 g/cm3.
Discovery 1803 (Smithson Tennant)
K2L8M18N32O14P2
Physical properties
Values for the element in its standard state.
- Density
- 22.61g/cm³
- Melting point
- 3,306K
- Boiling point
- 5,285K
- Atomic radius
- 128pm
- Bonding type
- Metallic
- Molar heat
- 24.7J/(mol·K)
Inside the atom
Electron arrangement and the energy behind its behavior.
Full electron configuration
1s, 2 electrons; 2s, 2 electrons; 2p, 6 electrons; 3s, 2 electrons; 3p, 6 electrons; 3d, 10 electrons; 4s, 2 electrons; 4p, 6 electrons; 4d, 10 electrons; 5s, 2 electrons; 5p, 6 electrons; 4f, 14 electrons; 5d, 6 electrons; 6s, 2 electrons;
[Xe] represents 54 core electrons. The full view shows them explicitly.
76 electrons Orbital order preserved from source
- Electronegativity
- 2.2Pauling scale
- First ionization energy
- 840kJ/mol
- Electron affinity
- 106kJ/mol
- Van der Waals radius
- Not available
Os OsmiumAtomic number 76
840kJ/mol
Atomic numberGaps indicate unavailable data
About osmium
- Appearance
- Silvery, blue cast
- Discovery
- 1803 (Smithson Tennant)
- Data source
- Read the reference
A missing value means it is unavailable in this reference dataset. Values can vary with measurement method and conditions.