77
Ir
Iridium
Transition metal period 6 group 9 d-block discovered: 1803
As a chemical element
Properties of the atom — they do not depend on what substance it is part of.
- Atomic number
- 77
- Atomic mass
- 192.22 a.m.u.
- Electron configuration
- [Xe]6s2 4f14 5d7
- Electronegativity
- 2.2 on the Pauling scale
- Atomic radius
- 202 pm
- Ionization energy
- 9.1 eV
- Electron affinity
- 1.565 eV
- Oxidation states
- +4, +3
As a simple substance
Properties of the substance these atoms form under ordinary conditions.
- State at 25 °C
- Solid
- Melting point
- 2719 K (2 445,85 °C)
- Boiling point
- 4701 K (4 427,85 °C)
- Density
- 22.42 g/cm³