Nobelium (No)
Nobelium is the chemical element with atomic number 102 and symbol No. It is a actinoid in period 7, with a standard atomic weight of 259 u.
Key facts
- Z
- 102
- Atomic weight
- 259 u no stable isotope
- Category
- actinoid
- State at 298 K
- Unknown
- Occurrence
- synthetic, radioactive
- Discovered
- 1958
- CAS
- 10028-14-5
Measured properties
| Property | Value | Source |
|---|---|---|
| Electronegativity | 1.3 | National Center for Biotechnology Information (NIH) |
| Melting point | 1,100 K | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 641.6 kJ/mol | National Center for Biotechnology Information (NIH) |
Electron configuration
- Noble gas notation
- [Rn] 5f¹⁴ 7s²
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 7s²
- Electrons per shell
- 2, 8, 18, 32, 32, 8, 2