42 - Molybdenum transition metal
Discovered by Carl Scheele in 1778
- Atomic Radius (Å)
Molybdenum is a chemical element with symbol Mo and atomic number 42. The name is from Neo-Latin molybdaenum, from Ancient Greek Μόλυβδος molybdos, meaning lead, since its ores were confused with lead ores. Molybdenum minerals have been known throughout history, but the element was discovered (in the sense of differentiating it as a new entity from the mineral salts of other metals) in 1778 by Carl Wilhelm Scheele.
| Shell | Electrons | Orbitals |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 8 | 2 in 2s + 6 in 2p |
| 3 | 18 | 2 in 3s + 6 in 3p + 10 in 3d |
| 4 | 13 | 2 in 4s + 6 in 4p + 5 in 4d |
| 5 | 1 | 1 in 5s |
95.95 u
Atomic Mass
2 Å
Atomic Radius
4912 K
Boiling Point
1.54 Å
Covalent Radius
10.28 g/cm³
Density
72.1
Electron Affinity
2.16
Electronegativity
7.09 eV
First Ionization Energy
2890.15 K
Melting Point
5
Number of Shells
42
Atomic Number
2, 8, 18, 13, 1
Electron Shell Occupations
