HHomeBackground Color:He
LiBeCalifornium Main PageBlack White GrayBCNOFNe
NaMgCalifornium Pictures PageAlSiPSClAr
KCaCalifornium Isotope DataScTiVCrMnFeCoNiCuZnGaGeAsSeBrKr
RbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXe
CsBaLaCePrNdPmSmEuGdTbDyHoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRn
FrRaAcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnUutUuqUupUuhUusUuo

Technical data for Californium

Click any property name to see plots of that property for all the elements.

Overview
NameCalifornium
SymbolCf
Atomic Number98
Atomic Weight251[note]
Density15.1 g/cm3
Melting Point900 °C
Boiling PointN/A

Thermal properties
PhaseSolid
Melting Point900 °C
Boiling PointN/A
Absolute Melting Point1173 K
Absolute Boiling PointN/A
Critical PressureN/A
Critical TemperatureN/A
Heat of FusionN/A
Heat of VaporizationN/A
Heat of CombustionN/A
Specific HeatN/A
Adiabatic IndexN/A
Neel PointN/A
Thermal ConductivityN/A
Thermal ExpansionN/A

Bulk physical properties
Density15.1 g/cm3
Density (Liquid)N/A
Molar Volume0.00001662
Brinell HardnessN/A
Mohs HardnessN/A
Vickers HardnessN/A
Bulk ModulusN/A
Shear ModulusN/A
Young ModulusN/A
Poisson RatioN/A
Refractive IndexN/A
Speed of SoundN/A
Thermal ConductivityN/A
Thermal ExpansionN/A

Reactivity
Valence4
Electronegativity1.3
ElectronAffinityN/A
Ionization Energies
608 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A
Heat of CombustionN/A
DOT Hazard ClassN/A
DOT NumbersN/A
EU NumberN/A
NFPA Fire RatingN/A
NFPA HazardsN/A
NFPA Health RatingN/A
NFPA Reactivity RatingN/A
RTECS NumberN/A
NFPA LabelN/A

Classifications
Alternate NamesNone
Names of AllotropesNone
Blockf
GroupN/A
Period7
Electron Configuration[Rn]5f107s2
ColorN/A
Discovery
1950 in United States
Gas phaseN/A
CAS NumberCAS7440-71-3
CID NumberN/A
Gmelin NumberN/A
NSC NumberN/A
RTECS NumberN/A

Electrical properties
Electrical TypeN/A
Electrical ConductivityN/A
ResistivityN/A
Superconducting PointN/A

Magnetic properties
Magnetic TypeN/A
Curie PointN/A
Mass Magnetic SusceptibilityN/A
Molar Magnetic SusceptibilityN/A
Volume Magnetic SusceptibilityN/A

Abundances
% in UniverseN/A
% in SunNone
% in MeteoritesNone
% in Earth's CrustNone
% in OceansNone
% in HumansNone

Atomic dimensions and structure
Atomic RadiusN/A
Covalent RadiusN/A
Van der Waals RadiusN/A
Crystal StructureSimple Hexagonal
Lattice Angles
π/2, π/2, 2 π/3
Lattice Constants
338, 338, 1102.5 pm
Space Group NameP63/mmc
Space Group Number194

Nuclear Properties
Half-Life900.6 y
Lifetime1.3×103 y
Decay ModeAlphaEmission
Quantum Numbers5I8
Neutron Cross Section2.9×103
Neutron Mass AbsorptionN/A
Known Isotopes
237Cf, 238Cf, 239Cf, 240Cf, 241Cf, 242Cf, 243Cf, 244Cf, 245Cf, 246Cf, 247Cf, 248Cf, 249Cf, 250Cf, 251Cf, 252Cf, 253Cf, 254Cf, 255Cf, 256Cf
Stable Isotopes
Isotopic Abundances


Notes on the properties of Californium:

Atomic Weight: Atomic mass number given for longest lived isotope.

Up to date, curated data provided by
Mathematica's ElementData function from Wolfram Research, Inc.

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