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Californium

Metal radioactivesynthetic
Symbol: Cf
Atomic number: 98
Atomic mass: (251.0796)
Group: Actinide
CAS-number: 7440-71-3

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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 32, 28, 8, 2
Orbitals: [Rn] 5f10 7s2
Electronegativity: --, 1.2
1. Ionization potential: 6.30 eV
2. Ionization potential: -- eV
3. Ionization potential: -- eV
Oxidation states: 4, 3
Electrical conductivity: --
Melting point: -- °C
Boiling point: -- °C
Specific heat: -- J/gK
Heat of fusion: -- kJ/mol
Heat of vaporization: -- kJ/mol
Thermal conductivity: 0.1 W/cmK
Atomic radius: -- Å
Ionic radius: -- Å
Covalent radius: -- Å
Atomic volume: -- cm³/mol
Density (293 K): -- g/cm³
Crystal structure: --

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
245Cf 0 245.068 0 44m EC, α View
246Cf 0 246.069 0 1.49d α View
247Cf 0 247 7/2 3.11h EC, α View
248Cf 0 248.072 0 334d α, SF View
249Cf 0 249.075 9/2 351y α View
250Cf 0 250.076 0 13.1y α, SF View
251Cf 0 251.08 1/2 9.0E02y α View
252Cf 0 252.082 0 2.638y α, SF View
253Cf 0 253 7/2 17.8d β-, α View
254Cf 0 254.087 0 60.5d SF, α View

Other info

Name origin:Named after the state and University of California.
Description:Synthetic radioactive metal. Powerful neutron emitter.
Discovered by:G.T.Seaborg, S.G.Tompson, A.Ghiorso, K.Street Jr.
Year:1950
Place:United States
Sources:Made by bombarding curium with helium ions.
Use(s):It has no significant commercial applications.