Kalifọ́rníọ̀m tabi Californium je apilese kemika onide alagbaradio to ni ami-idamo Cf ati nomba atomu 98. Apilese yi koko je mimuwaye ni 1950 nipa didigbolu curium pelu awon igbonwo alpha (awon ioni helium) ni Yunifasiti Kalifornia ni Berkeley. Ohun ni apilese teyinuraniom kefa to je sisopapo. Californium ni ikan ninu awon apilese isulopo atomu gigajulo to je mimuwaye ni iye to se e won. O je sisoloruko fun ipinle ati yunifasiti Kalifornia. CRC 2006, p. 1.14. Greenwood & Earnshaw 1997, p. 1265. 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. PMID 30040397.