Nobelium
Nobelium (锘, symbol No) is chemical element number 102, an Actinide in period 7 of the periodic table, with a standard atomic weight of about 259. Synthetic element. Named after Alfred Nobel.
Properties
| Atomic number | 102 |
|---|---|
| Symbol | No |
| Atomic mass | 259 u |
| Category | Actinide |
| Period | 7 |
| Group | — |
| Electron configuration | [Rn] 5f¹⁴ 7s² |
| Electronegativity | 1.3 |
| Covalent radius | — |
| Density | 9.9 g/cm³ |
| Melting point | 1100 K |
| Boiling point | — |
| Discovery | Flerov et al., 1966 |
Overview
Synthetic element. Named after Alfred Nobel. Nobelium (No) is an Actinide with atomic number 102, located in period 7. As an actinide it is typically radioactive and closely tied to nuclear technology.
It has the configuration [Rn] 5f¹⁴ 7s² and an electronegativity near 1.3; its 2 outer-shell electrons drive its bonding. Under standard conditions it exists as a solid; it melts near 1100 K (826.9 °C), has a density around 9.9 g/cm³.
It is widely used in Research. It is regarded as a high-hazard element, so handle it with appropriate care. It was first described by Flerov et al. in 1966. See more trends in the visualization center.
Electron shells
Electrons per shell: 2 · 8 · 18 · 32 · 32 · 8 · 2
Main uses
- Research
Hazard
Compounds containing Nobelium
No compounds in this knowledge base contain Nobelium yet.
Data sources
Atomic mass uses IUPAC (CIAAW) standard atomic weights; the covalent radius is from Cordero et al. (2008). Verify on the RSC Periodic Table, PubChem and Wikipedia. Educational reference only.