Template:Infobox californium

Californium, ₉₈Cf

A very small disc of silvery metal, magnified to show its metallic texture
Californium
Pronunciation	/ˌkæləˈfɔːrniəm/ Template:Error-small ​(KAL-ə-FOR-nee-əm)
Appearance	silvery
Mass number	[251]
Californium in the periodic table
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Dy ↑ Cf ↓ — berkelium ← californium → einsteinium
Atomic number (Z)	98
Group	f-block groups (no number)
Period	period 7
Block	f-block
Electron configuration	[Rn] 5f10 7s2
Electrons per shell	2, 8, 18, 32, 28, 8, 2
Physical properties
Phase at STP	solid
Melting point	1173 K ​(900 °C, ​1652 °F)
Boiling point	1743 K ​(1470 °C, ​2678 °F) (estimation)
Density (near r.t.)	15.1 g/cm3
Atomic properties
Oxidation states	common: +3 +2, +4, +5
Electronegativity	Pauling scale: 1.3
Ionization energies	1st: 608 kJ/mol
Color lines in a spectral range Spectral lines of californium
Other properties
Natural occurrence	synthetic
Crystal structure	​double hexagonal close-packed (dhcp) Double hexagonal close packed crystal structure for californium
Mohs hardness	3–4
CAS Number	7440-71-3
History
Naming	after California, where it was discovered
Discovery	S. G. Thompson, K. Street, Jr., A. Ghiorso and G. T. Seaborg (Lawrence Berkeley National Laboratory) (1950)
First isolation	R. G. Haire and R. D. Baybarz (1974)
Isotopes of californium
Main isotopes Decay Isotope abun­dance half-life (t1/2) mode pro­duct 248Cf synth 333.5 d α100% 244Cm SF<0.01% – 249Cf synth 351 y α100% 245Cm SF≪0.01% – 250Cf synth 13.08 y α99.9% 246Cm SF0.08% – 251Cf synth 898 y α 247Cm 252Cf synth 2.645 y α96.9% 248Cm SF3.1% – 253Cf synth 17.81 d β−99.7% 253Es α0.31% 249Cm 254Cf synth 60.5 d SF99.7% – α0.31% 250Cm

Cf · Californium
Bk ← ibox Bk	iso 98 Cf  [] IB-Cf [] IBisos []	→ Es ibox Es
File:Symbol category class.svg cat:Cf (0) File:Symbol category class.svg cat:Cf-isotopes (0)  Commons  Wikidata:Q1888 File:Wiktionary-logo.svg Wiktionary
indexes by PT (page)

child table, as reused in {IB-Cf}
Main isotopes of californium
Main isotopes Decay Isotope abun­dance half-life (t1/2) mode pro­duct 248Cf synth 333.5 d α100% 244Cm SF<0.01% – 249Cf synth 351 y α100% 245Cm SF≪0.01% – 250Cf synth 13.08 y α99.9% 246Cm SF0.08% – 251Cf synth 898 y α 247Cm 252Cf synth 2.645 y α96.9% 248Cm SF3.1% – 253Cf synth 17.81 d β−99.7% 253Es α0.31% 249Cm 254Cf synth 60.5 d SF99.7% – α0.31% 250Cm

Data sets read by {{Infobox element}}
Name and identifiers
Symbol etymology (11 non-trivial)
Top image (caption, alt)	caption: alt:
Pronunciation
Allotropes (overview)
Group (overview)
Period (overview)
Block (overview)
Natural occurrence
Phase at STP
Oxidation states
Spectral lines image
Electron configuration (cmt, ref)
Isotopes
Standard atomic weight
most stable isotope
File:Notification-icon-Wikidata-logo.svg Wikidata
Wikidata *
* Not used in {{Infobox element}} (2023-01-01) See also {{Index of data sets}} · Cat:data sets (0) · (this table: )

References

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