24
Cr
Chromium
Transition metal period 4 group 6 d-block discovered: 1797
As a chemical element
Properties of the atom — they do not depend on what substance it is part of.
- Atomic number
- 24
- Atomic mass
- 51.996 a.m.u.
- Electron configuration
- [Ar]3d5 4s1
- Electronegativity
- 1.66 on the Pauling scale
- Atomic radius
- 189 pm
- Ionization energy
- 6.767 eV
- Electron affinity
- 0.666 eV
- Oxidation states
- +6, +3, +2
As a simple substance
Properties of the substance these atoms form under ordinary conditions.
- State at 25 °C
- Solid
- Melting point
- 2180 K (1 906,85 °C)
- Boiling point
- 2944 K (2 670,85 °C)
- Density
- 7.15 g/cm³