42Mo95.95
Molybdenum
Transition Metal
Solid at STP
Period 5Group 6Block DDiscovered 1778
[Kr]5s1 4d5
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.
📖 Read more on Wikipedia →Atomic Properties
| Atomic Number | 42 |
| Atomic Mass | 95.95 u |
| Electron Configuration | [Kr]5s1 4d5 |
| Oxidation States | +6 |
| Electronegativity | 2.16 (Pauling) |
| Atomic Radius | 209 pm |
| Ionization Energy | 7.092 eV |
| Electron Affinity | 0.746 eV |
| Block | D |
Physical Properties
| Appearance | gray metallic |
| Standard State | Solid |
| Melting Point | 2896 K (2622.8 °C) |
| Boiling Point | 4912 K (4638.9 °C) |
| Density | 10.2 g/cm³ |
| Molar Heat | 24.06 J/(mol·K) |
| CPK Color | #54B5B5 |
Classification
| Category | Transition Metal |
| Group Block | Transition metal |
| Period | 5 |
| Group | 6 |
| Block | D |
Discovery
| Year Discovered | 1778 |
| Discovered By | Carl Wilhelm Scheele |
| Electron Shells | 2, 8, 18, 13, 1 |