Curium (Cm)
Curium is the chemical element with atomic number 96 and symbol Cm. It is a actinoid in period 7, with a standard atomic weight of 247 u.
Key facts
- Z
- 96
- Atomic weight
- 247 u no stable isotope
- Category
- actinoid
- State at 298 K
- Solid
- Occurrence
- synthetic, radioactive
- Discovered
- 1944
- CAS
- 7440-51-9
Measured properties
| Property | Value | Source |
|---|---|---|
| Electronegativity | 1.3 | National Center for Biotechnology Information (NIH) |
| Melting point | 1,618 K | National Center for Biotechnology Information (NIH) |
| Boiling point | 3,400 K | National Center for Biotechnology Information (NIH) |
| Density stp | 13.51 g/cm³ | National Center for Biotechnology Information (NIH) |
| Atomic radius empirical | 245 pm | National Center for Biotechnology Information (NIH) |
| Ionization energy 1st | 580.8 kJ/mol | National Center for Biotechnology Information (NIH) |
Electron configuration
- Noble gas notation
- [Rn] 5f⁷ 6d¹ 7s²
- Full notation
- 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f⁷ 6s² 6p⁶ 6d¹ 7s²
- Electrons per shell
- 2, 8, 18, 32, 25, 9, 2