Molybdenum (Mo)
Molybdenum (Mo) is element 42 of the periodic table, a transition metal in period 5 and group 6. Its standard atomic weight is 95.95, so one mole of molybdenum atoms has a mass of 95.95 g. At room temperature it is a solid; it melts at 2622.85 °C and boils at 4638.85 °C.
| Atomic number | 42 |
|---|---|
| Symbol | Mo |
| Standard atomic weight | 95.95 |
| Molar mass | 95.95 g/mol |
| Category | Transition metal |
| Group | 6 |
| Period | 5 |
| Block | d-block |
| Electron configuration | [Kr] 5s1 4d5 |
| Oxidation states | +6 |
| Electronegativity (Pauling) | 2.16 |
| Atomic radius (van der Waals) | 209 pm |
| First ionisation energy | 7.092 eV (684.3 kJ/mol) |
| Electron affinity | 0.746 eV |
| State at room temperature | Solid |
| Melting point | 2896 K (2622.85 °C) |
| Boiling point | 4912 K (4638.85 °C) |
| Density | 10.2 g/cm³ |
| Discovered | 1778 |
Group 6
Calculate with Molybdenum
Atomic weight: IUPAC CIAAW standard atomic weight. Other properties: PubChem (U.S. National Library of Medicine, public domain). Values such as melting point and radius depend on how they were measured; check a data book for precise work.