98 Cf 251
Californium
Actinide
Californium (Cf) is a chemical element with atomic number 98, classified as a actinide. At room temperature it is a solid. It was discovered in 1950 by Glenn T. Seaborg et al..
Properties
- Atomic number
- 98
- Atomic mass
- 251 u
- Category
- Actinide
- Group
- 0
- Period
- 7
- Block
- f-block
- Electron configuration
- [Rn] 5f¹⁰ 7s²
- Phase at STP
- Solid
- Density
- 15.1 g/cm³
- Melting point
- 1173 K (899.9 °C)
- Boiling point
- 1743 K (1469.8 °C)
- Electronegativity
- 1.3
- Atomic radius
- 245 pm
- Ionization energy
- 6.282 eV
- Discovery
- 1950 · Glenn T. Seaborg et al.
Common uses
Neutron sources, cancer treatment, oil well logging
Did you know?
Extremely expensive neutron source worth millions per gram.