berkelium /bəːˈkiːlɪəm, ˈbəːklɪəm/

b

I. noun [ mass noun]

1. (Symbol: Bk) the chemical element of atomic number 97, a radioactive metal of the actinide series. Berkelium does not occur naturally and was first made by bombarding americium with helium ions.
– origin 1949: from Berkeley (where it was first made) + -ium.

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