98
Cf
Californium
(251)
2818322882
#98
Californium
actinide· Solid·251 u
Californium is a radioactive metallic chemical element with symbol Cf and atomic number 98. The element was first made in 1950 at the University of California Radiation Laboratory in Berkeley, by bombarding curium with alpha particles (helium-4 ions). It is an actinide element, the sixth transuranium element to be synthesized, and has the second-highest atomic mass of all the elements that have been produced in amounts large enough to see with the unaided eye (after einsteinium).
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Identity
- Symbol
- Cf
- Atomic Number
- 98
- Atomic Mass
- 251 u
- Category
- actinide
- Block
- f-block
- Period
- 7
- Group
- 3
- Appearance
- silvery
- Year Discovered
- 1950 CE
- Discovered By
- Lawrence Berkeley National Laboratory
- Named By
- California
Electrons
- Configuration
- [Rn] 5f10 7s2
- Full Configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f10
- Shells
- 2, 8, 18, 32, 28, 8, 2
- Electronegativity
- 1.3
- Electron Affinity
- -97.31
- Oxidation States
- +3
- Ionization Energies
- 608
Physical Properties
- State at
- Solid
- Melting Point
- 1173
- Boiling Point
- 1743
- Density
- 15.1
- Crystal Structure
- HEX
- Magnetic Ordering
- n/a
Mechanical
Thermal & Electrical
- Specific Heat
- 120 J/(kg K) J/(g·K)
- Heat of Vaporization
- 162 kJ/mol kJ/mol
- Heat of Fusion
- 8 kJ/mol kJ/mol
Abundance
- Universe
- 0
- Sun
- 0
- Meteorite
- 0
- Earth's Crust
- 15.1 ppm
- Ocean
- 0
- Human Body
- 0