Californium

Metal

synthetic

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

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Physical data

Electronic 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: --

Thermal data

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

Steric data

Atomic radius: -- Å
Ionic radius: -- Å
Covalent radius: -- Å
Atomic volume: -- cm³/mol
Density (293 K): -- g/cm³
Crystal structure: --

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Isotopes

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

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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.

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