Californium
actinide
Properties
- Atomic number
- 98
- Atomic mass
- 251 u
- Category
- actinide
- Group
- f-block
- Period
- 7
- Block
- f-block
- State (room temp)
- Solid
- Outer-shell electrons
- 2
- Electronegativity
- 1.3 (Pauling)
- Density
- 15.1 g/cm³
- Melting point
- 899.85 °C
- Boiling point
- 1469.85 °C
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁰
Noble-gas shorthand: [Rn] 5f¹⁰ 7s²
Electrons per shell: 2, 8, 18, 32, 28, 8, 2 — that's 2 in the outermost shell.
About Californium
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).
- Discovered by Lawrence Berkeley National Laboratory
- Appearance: silvery
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.