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What the name means: Californium was named after the state of California in the USA where the Berkeley Laboratory is situated.
Who identified californium?: Stanley Gerald Thompson, Kenneth Street and their co-workers produced californium in 1950 by bombarding curium atoms with α (alpha) particles (helium nuclei).
STP = standard temperature and pressure.
About californium: Californium was first made in milligramme amounts in 1960. Some forms of the atom (isotopes) have a half life of a few hundred years.
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