77 · Ir
Iridium
Isolated by Tennant in 1803.
Identity
- Atomic number
- 77
- Symbol
- Ir
- Canonical name
- Iridium
- Category
- transition metal
- Group
- 9
- 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
- 192.2173 u
- Electron configuration
- [Xe] 4f14 5d7 6s2
- Electrons per shell
- 2, 8, 18, 32, 15, 2
- Standard state
- solid
- Density
- 22.56 g/cm³
- Melting point
- 2,719 K
- Boiling point
- 4,403 K
- Electronegativity
- 2.2 Pauling
- First ionization energy
- 880 kJ/mol
- Electron affinity
- 150.94 kJ/mol
History
Iridium
Discovery · confirmed · 1803
Tennant isolates iridium from the same platinum residues as osmium.
Etymology
- Theme
- mythology
- Language
- grec
- Root
- Iris
- Meaning
- Iris, goddess of the rainbow
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