24 - Chromium transition metal
Discovered by Louis Nicolas Vauquelin in 1797
- Atomic Radius (Å)
Chromium is a chemical element with symbol Cr and atomic number 24. It is the first element in Group 6. It is a steely-gray, lustrous, hard and brittle metal which takes a high polish, resists tarnishing, and has a high melting point.
| Shell | Electrons | Orbitals |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 8 | 2 in 2s + 6 in 2p |
| 3 | 13 | 2 in 3s + 6 in 3p + 5 in 3d |
| 4 | 1 | 1 in 4s |
52 u
Atomic Mass
1.9 Å
Atomic Radius
2944 K
Boiling Point
1.39 Å
Covalent Radius
7.19 g/cm³
Density
65.21
Electron Affinity
1.66
Electronegativity
6.77 eV
First Ionization Energy
2130.15 K
Melting Point
4
Number of Shells
24
Atomic Number
2, 8, 13, 1
Electron Shell Occupations
