Nobelium (No)
Nobelium (No) is element 102, an actinide. Atomic mass 259, configuration [Rn] 5f¹⁴ 7s². Properties, isotopes, oxidation states, uses and history, with an interactive 3D atom model.
Key facts
| Atomic number | 102 |
|---|---|
| Symbol | No |
| Standard atomic weight | 259 |
| Category | Actinide |
| Period | 7 |
| State at room temperature | Solid |
| Electron configuration | [Rn] 5f¹⁴ 7s² |
| Valence electrons | 2 (Variable) |
| Common oxidation states | +3 |
| Common ions | No common ions |
| First ionization energy | 642 kJ/mol |
| Melting point | ~827°C |
Common uses
- Research only
Where it matters
- Naming controversy (Disputed between USA, Sweden, USSR)
Hazards
- Radioactive
History
| Discovered | 1966 |
|---|---|
| Discovered by | JINR (Russia) |
| Name | Alfred Nobel |