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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.
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.
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.
It was the sixth transuranic element to be synthesized. Californium is one of the highest atomic mass elements to have been produced in weighable amounts. It is named for the U.S. state of California and the University of California. Californium was co-discovered by Stanley G. Thompson, Albert Ghiorso, and Glenn T. Seaborg in 1950. [75] 1951 ...
This list of chemical elements named after places includes elements named both directly and indirectly for places. 41 of the 118 chemical elements have names associated with, or specifically named for, places around the world or among astronomical objects.
The group found Kentucky had a high threat of farmland conversion compared to other states — and “scored among the lowest states for policies and programs that address the threat of conversion.”
The Valley of the Drums is a 23-acre (9.3-hectare) toxic waste site in Brooks, Kentucky [2] in northern Bullitt County, near Louisville. It became a collection point for toxic wastes starting sometime in the 1960s. It caught the attention of state officials when some of the drums caught fire and burned for more than a week in 1966.