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Californium was first made at University of California Radiation Laboratory, Berkeley, by physics researchers Stanley Gerald Thompson, Kenneth Street Jr., Albert Ghiorso, and Glenn T. Seaborg, about February 9, 1950. [28] It was the sixth transuranium element to be discovered; the team announced its discovery on March 17, 1950. [29] [30]
He discovered together with Glenn T. Seaborg several of the transuranium elements. One of the elements is Californium, which he and several others made. Thompson was also a leader of the research teams that discovered the next three transuranium elements: einsteinium, fermium and mendelevium (atomic numbers 99, 100 and 101). [1]
He was part of the team that discovered elements 97 and 98 (berkelium and californium) in 1949 and 1950. [1] Street was born in 1920 in Berkeley, California. He obtained his degree in chemistry in 1943 from the University of California, Berkeley. [1]
Seaborg was the principal or co-discoverer of ten elements: plutonium, americium, curium, berkelium, californium, einsteinium, fermium, mendelevium, nobelium and element 106, which, while he was still living, was named seaborgium in his honor. He said about this naming, "This is the greatest honor ever bestowed upon me—even better, I think ...
So, element 105 was named dubnium, and element 106 was named seaborgium. The elements were placed in the periodic table’s seventh row, which is above the row of lanthanides and the row of actinides.
In 1999, evidence for two superheavy elements (element 116 and element 118) was published by a group in Berkeley. The discovery group intended to propose the name ghiorsium for element 118, but eventually the data were found to have been tampered and in 2002 the claims were withdrawn. Ghiorso's lifetime output comprised about 170 technical ...
At the time, the multiple neutron absorption was thought to be an extremely rare process, but the identification of 244 Pu indicated that still more neutrons could have been captured by the uranium, producing new elements heavier than californium. [6] The element was discovered by a team headed by Albert Ghiorso.
One such element is Promethium. First discovered 80 years ago in 1945, Promethium is a lanthanide (one of a series of 15 metallic chemicals also known as rare earth metals) with the atomic number ...