Page "Californium" Paragraph 1
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Two crystalline forms exist for californium under normal pressure: one above 900 ° C and one below 900 ° C.
A third form exists at high pressure.
Californium slowly tarnishes in air at room temperature.
Compounds of californium are dominated by a chemical form of the element, designated californium ( III ), that can participate in three chemical bonds.
The most stable of californium's twenty known isotopes is californium-251, which has a half-life of 898 years.
This short half-life means the element is not found in significant quantities in the Earth's crust.
Californium-252, with a half-life of about 2. 64 years, is the most common isotope used and is produced at the Oak Ridge National Laboratory in the United States and the Research Institute of Atomic Reactors in Russia.
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