42 Mo Molybdenum 95.95
Transition metal
Molybdenum 钼
[Kr] 4d⁵ 5s¹
- Period 5
- Group 6
- Block d
- Solid
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d⁵ 5s¹
Orbital diagram (valence)
- Electrons per shell
- 2, 8, 18, 13, 1
- Unpaired electrons
- 6
- Zeff (Slater)
- 2.95
Properties
- Atomic weight
- 95.95
- Electronegativity (Pauling)
- 2.16
- First ionization energy
- 684.3 kJ/mol
- Electron affinity
- 71.98 kJ/mol
- Covalent radius
- 154 pm
- van der Waals radius
- 209 pm
- Melting point
- 2896 K
- Boiling point
- 4912 K
- Density
- 10.2 g/cm³
- Melting / boiling point
- 2622.8 °C / 4638.9 °C
- Common oxidation states
- +6
- Discovered
- 1778
Molybdenum in the course
The lessons that discuss this element most (ranked by mentions).
Periodic trend
Data: PubChem periodic table (public domain); atomic weights are IUPAC abridged standard values; covalent radii from Cordero et al. (2008).