97. Berkelium
Name: Berkelium
Symbol: Bk
Atomic Number: 97
Atomic Mass: (247.0) amu
Melting Point: Unknown
Boiling Point: Unknown
Number of Protons/Electrons: 97
Number of Neutrons: 150
Classification: Rare Earth
Crystal Structure: Unknown
Density(293 K): Unknown
Color: Unknown
Berkelium is a radioactive rare earth metal, named after the University of California at Berkeley (USA). Apparently, berkelium tends to accumulate in the skeletal system. It is of no commercial importance and only a few of its compounds are known.
Berkelium was first synthesized by Glenn T. Seaborg, Albert Ghiorso, Stanley G. Thompson, and Kenneth Street, Jr at the University of California, Berkeley in December 1949. The team used a cyclotron to bombard a milligram-sized target of americium-241 with alpha particles to produce berkelium-243 (half-life 4.5 hours) and two free neutrons. One of the longest lived isotopes of the element, berkelium-249 (half-life 320 days), was later synthesized by subjecting a curium-244 target with an intense beam of neutrons.
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