Californium elements not found in nature !
Californium phase at room temperature solids and group 20 Californium is a redioactive chemical elements symbols CF atomic number 98 and atomic weights (average of the mass) 251u. The discovery in 17 March 1950 American scientists California University. Density is unknown melting point unknown boiling point 1173 Kelvin. 252u is a strong neutron emitting elements with industry used as the military application metal detector and detected metals way of airplane fatigue and stress temprature. The also use in medical sciences but not found in nature. It is soft elements with symbol CF colour silver white. The name is Californium because invention to be in the California. the high price elements soft with rare.