Californium, 98 General properties Pronunciation Template:Infobox element/pronunciation Appearance silvery Standard atomic weight (A r, standard ) Template:Infobox element/standard atomic weight Mass number Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)Californium in the periodic table Template:Infobox element/periodic table Atomic number (Z ) 98 Group Template:Infobox element/group Period period 7 Block f-block Element category Template:Infobox element/category format Electron configuration [Rn ] 5f10 7s2 Template:Sfn Electrons per shell
2, 8, 18, 32, 28, 8, 2 Physical properties Phase at STP solid Melting point 1173 K (900 °C, 1652 °F)Template:Sfn Boiling point 1743 K (1470 °C, 2678 °F) (estimation) [1] Density (near r.t. ) 15.1 g/cm3 Template:Sfn Atomic properties Oxidation states Template:Infobox element/symbol-to-oxidation-state Electronegativity Pauling scale: 1.3Template:Sfn [[Ionization energy|Template:Engvar energies]] Template:Infobox element/spectral lines Other properties Crystal structure Template:Infobox element/crystal structure Mohs hardness 3–4Template:Sfn CAS Number 7440-71-3Template:Sfn History Naming after California , where it was discovered Discovery Lawrence Berkeley National Laboratory (1950) Main isotopes of californium Template:Sfn [2] Template:Infobox element/isotopes table | references
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↑ Joseph Jacob Katz; Glenn Theodore Seaborg; Lester R. Morss (1986). The Chemistry of the actinide elements ISBN 9780412273704 . Retrieved 11 July 2011 . ↑ NNDC contributors (2008). Sonzogni, Alejandro A. (Database Manager) (ed.). "Chart of Nuclides" . National Nuclear Data Center, Brookhaven National Laboratory. Retrieved 1 March 2010 . ↑ Kovács, Attila; Dau, Phuong D.; Marçalo, Joaquim; Gibson, John K. (2018). "Pentavalent Curium, Berkelium, and Californium in Nitrate Complexes: Extending Actinide Chemistry and Oxidation States". Inorg. Chem . American Chemical Society. 57 (15): 9453–9467. doi :10.1021/acs.inorgchem.8b01450 . 