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KB Term:
Berkelium
Sigma KEE - Berkelium
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Berkelium
Radioactive metallic transuranic element. Belongs to actinoid series. Eight known isotopes, the most common Bk-247, has a half-life of 1.4*10^3 years. First produced by Glenn T. Seaborg and associates in 1949 by bombarding americium-241 with alpha particles.
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単体
The
Class
of
PureSubstance
s that cannot be separated into two or more
Substance
s by ordinary chemical (or physical) means. This excludes nuclear reactions.
ElementalSubstance
s are composed of only one kind of atom. Examples: Iron (Fe), copper (Cu), and oxygen (O_2).
ElementalSubstance
s are the simplest
PureSubstance
s.
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