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42
Mo
95.95
Molybdenum
Transition metals · Group 6 · Period 5
Atomic properties
| Atomic number | 42 |
|---|---|
| Symbol | Mo |
| Standard atomic weight | 95.95 |
| Classification | Transition metals |
| Group | 6 |
| Period | 5 |
| Block | d-block |
| Electron configuration | [Kr] 4d5 5s1 |
| Electronegativity (Pauling) | 2.16 |
| Common oxidation states | +6, +4 |
Physical properties
| Phase at 20 °C | Solid |
|---|---|
| Density | 10.28 g/cm³ |
| Melting point | 2623 °C |
| Boiling point | 4639 °C |
| Discovered | 1778 |
| CAS number | — |