Californium

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Californium,  98Cf
A verra smaw disc o sillery metal, magnifee'd tae shaw its metallic textur
General properties
Appearance silvery
Mass nummer 251 (most stable isotope)
Californium in the periodic cairt
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 Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) 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 Mercur (element) Thallium Leid (element) 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 Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium
Dy

Cf

(Upn)
berkeliumcaliforniumeinsteinium
Atomic nummer (Z) 98
Group group n/a
Period period 7
Element category   actinide
Block f-block
Electron confeeguration [Rn] 5f10 7s2[1]
Electrons per shell
2, 8, 18, 32, 28, 8, 2
Pheesical properties
Phase (at STP) solit
Meltin pynt 1173 K ​(900 °C, ​1652 °F)[2]
Bylin pynt 1743 K ​(1470 °C, ​2678 °F) (estimation)[3]
Density (near r.t.) 15.1 g/cm3[2]
Atomic properties
Oxidation states 2, 3, 4[4]
Electronegativity Pauling scale: 1.3[5]
Ionisation energies
  • 1st: 608 kJ/mol[6]
Color lines in a spectral range
Miscellanea
Crestal structur ​dooble hexagonal close packed
[[File:dooble hexagonal close packed|50px|alt=Dooble hexagonal close packed creestal structur for californium|Dooble hexagonal close packed creestal structur for californium]]
Mohs haurdness 3–4[7]
CAS Nummer 7440-71-3[2]
History
Namin after Californie, whaur it was discovered
Diskivery Lawrence Berkeley Naitional Laboratory (1950)
Main isotopes o californium
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct
248Cf syn 333.5 d α (100%) 6.369 244Cm
SF (2.9×10−3%) 0.0029
249Cf syn 351 y α (100%) 6.295 245Cm
SF (5.0×10−7%) 4.4×10−7
250Cf syn 13.08 y α (99.92%) 6.129 246Cm
SF (0.08%) 0.077
251Cf syn 898 y α 247Cm
252Cf syn 2.645 y α (96.91%) 6.217 248Cm
SF (3.09%)
253Cf syn 17.81 d β (99.69%) 0.29 253Es
α (0.31%) 6.126 249Cm
254Cf syn 60.5 d SF (99.69%)
α (0.31%) 5.930 250Cm
Isotope references [8][9]
| references | in Wikidata

Californium is a radioactive metallic chemical element wi seembol Cf an atomic nummer 98.

  1. CRC 2006, p. 1.14.
  2. 2.0 2.1 2.2 2.3 CRC 2006, p. 4.56.
  3. Joseph Jacob Katz; Glenn Theodore Seaborg; Lester R. Morss (1986). The Chemistry of the actinide elements. Chapman and Hall. p. 1038. ISBN 9780412273704. Retrieved 11 Julie 2011. 
  4. Greenwood 1997, p. 1265.
  5. Emsley 1998, p. 50.
  6. CRC 2006, p. 10.204.
  7. CRC 1991, p. 254.
  8. CRC 2006, p. 11.196.
  9. NNDC contributors (2008). Sonzogni, Alejandro A. (Database Manager), ed. "Chart of Nuclides". National Nuclear Data Center, Brookhaven National Laboratory. Retrieved 2010-03-01.