76
Os
Osmium
Transition metal period 6 group 8 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
- 76
- Atomic mass
- 190.2 a.m.u.
- Electron configuration
- [Xe]6s2 4f14 5d6
- Electronegativity
- 2.2 on the Pauling scale
- Atomic radius
- 216 pm
- Ionization energy
- 8.7 eV
- Electron affinity
- 1.1 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
- 3306 K (3 032,85 °C)
- Boiling point
- 5285 K (5 011,85 °C)
- Density
- 22.57 g/cm³