76 · Os
Osmium
Isolated by Tennant in 1803.
Identity
- Atomic number
- 76
- Symbol
- Os
- Canonical name
- Osmium
- Category
- transition metal
- Group
- 8
- Period
- 6
- Block
- d
Properties
These quantities come from the Periodic Table JSON compilation. They have not yet been checked, one by one, against CIAAW atomic weights or NIST measurements. A value marked estimated is not a measurement.
- Atomic mass
- 190.233 u
- Electron configuration
- [Xe] 4f14 5d6 6s2
- Electrons per shell
- 2, 8, 18, 32, 14, 2
- Standard state
- solid
- Density
- 22.59 g/cm³
- Melting point
- 3,306 K
- Boiling point
- 5,285 K
- Electronegativity
- 2.2 Pauling
- First ionization energy
- 840 kJ/mol
- Electron affinity
- 103.99 kJ/mol
History
Osmium
Discovery · confirmed · 1803
Tennant isolates osmium from platinum residues, together with iridium.
Etymology
- Theme
- property
- Language
- grec
- Root
- osme
- Meaning
- smell
Scientists
Places and institutions
- London — historical setting : United Kingdom — present country : United Kingdom
See also
Sources
- IUPAC, Periodic Table of the Elements
- Bowserinator, Periodic Table JSON. Compilation secondaire d’où viennent les grandeurs physiques importées (masse, densité, températures, énergies). Elles ne sont pas revérifiées une à une auprès du NIST ou de la CIAAW.
- John Emsley, Nature’s Building Blocks: An A–Z Guide to the Elements