That element is Berkelium, symbol "Bk" and atomic number 97, a radioactive element in the heavy "actonoid" series. Berkelium is named after the Californian university town of Berkeley where it was first synthesized.
Scientists at the University of California's Ernest Orlando Lawrence Berkeley National Laboratory (simply known as "Berkeley Lab") first synthesized Berkelium in 1949. They created it by bombarding a small piece of Americium ("Am" atomic number 95) with alpha particles within a cyclotron.
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The element Californium (Cf) is named after the state of California, where it was first synthesized in 1950 at the University of California, Berkeley. It is a radioactive element with various applications in nuclear reactors and scientific research.
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The element californium, Cf is named after the state of California, in which it was discovered at the Univeresity of California Berkley.
Californium is rare because it is a synthetic element that is not naturally occurring in the Earth's crust. It is produced in nuclear reactors or particle accelerators by bombarding other atoms with neutrons. Its rarity is also due to its short half-life and the difficulty in isolating and purifying it.
Einsteinium is the element named after Albert Einstein. It is a synthetic element with the atomic number 99.
The element named after a district in Thessaly, Greece is Thallium.
Helium is named after the Greek god of the Sun, Helios.
There is no known element named after Gual. The periodic table consists of elements named after scientists, places, mythological figures, and more, but Gual does not correspond to any known element.