42Mo95.95
Molybdenum (Mo)
Element 42 Ā· Transition metal
Molybdenum (Mo) is a chemical element with atomic number 42. It is classified as a transition metal in period 5, group 6 of the periodic table (the d-block). Its standard atomic weight is 95.95 u and its ground-state electron configuration is [Kr] 4dāµ 5sĀ¹.
Molybdenum facts
| Atomic number (Z) | 42 |
|---|---|
| Symbol | Mo |
| Standard atomic weight | 95.95 u |
| Category | Transition metal |
| Group | 6 |
| Period | 5 |
| Block | d-block |
| Electron configuration | [Kr] 4dāµ 5sĀ¹ |
| Electronegativity (Pauling) | 2.16 |
| State at 20 Ā°C | Solid |
| Protons / electrons | 42 / 42 |
| Neutrons (most common isotope, approx.) | 54 |
| Molar mass | 95.95 g/mol |