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Californium slowly tarnishes in air at room temperature. Californium compounds are dominated by the +3 oxidation state. The most stable of californium's twenty known isotopes is californium-251, with 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(III) oxychloride (CfOCl) was the first californium compound to be discovered. [15] Californium(III) polyborate is unusual in that californium is covalently bound to the borate. [16] Tris(cyclopentadienyl)californium(III) (Cp 3 Cf) presents itself as ruby red crystals.
Californium (98 Cf) is an artificial element, and thus a standard atomic weight cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was 245 Cf in 1950. There are 20 known radioisotopes ranging from 237 Cf to 256 Cf and one nuclear isomer, 249m Cf.
Kenneth Street Jr. (1920 – 13 March 2006) was an American chemist.He was part of the team that discovered elements 97 and 98 (berkelium and californium) in 1949 and 1950.
As of 2008, the cost of weapons-grade plutonium was around $4,000/gram, [2] and californium exceeded $60,000,000/gram. [3] Einsteinium is the heaviest element that has been produced in macroscopic quantities.
Synthesis of americium, berkelium, and californium followed soon. Einsteinium and fermium were discovered by a team of scientists led by Albert Ghiorso in 1952 while studying the composition of radioactive debris from the detonation of the first hydrogen bomb. [ 19 ]
Pages in category "Californium" The following 4 pages are in this category, out of 4 total. This list may not reflect recent changes. ...
Einsteinium's melting point (860 °C) is also relatively low – below californium (900 °C), fermium (1527 °C) and holmium (1461 °C). [ 5 ] [ 27 ] Einsteinium is a soft metal, with a bulk modulus of only 15 GPa, one of the lowest among non- alkali metals .