27
Co
Cobalt
Transition metal period 4 group 9 d-block discovered: 1735
As a chemical element
Properties of the atom — they do not depend on what substance it is part of.
- Atomic number
- 27
- Atomic mass
- 58.93319 a.m.u.
- Electron configuration
- [Ar]4s2 3d7
- Electronegativity
- 1.88 on the Pauling scale
- Atomic radius
- 192 pm
- Ionization energy
- 7.881 eV
- Electron affinity
- 0.661 eV
- Oxidation states
- +3, +2
As a simple substance
Properties of the substance these atoms form under ordinary conditions.
- State at 25 °C
- Solid
- Melting point
- 1768 K (1 494,85 °C)
- Boiling point
- 3200 K (2 926,85 °C)
- Density
- 8.86 g/cm³