HELIUM a gaseous element
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heliumsHELIUM, a gaseous element
californiuma synthetic element produced in trace quantities by helium isotope bombardment of curium
californiumsCALIFORNIUM, a synthetic element produced in trace quantities by helium isotope bombardment of curium
californiumThe chemical element of atomic number 98, a radioactive metal of the actinide series, first produced by bombarding curium with helium ions
berkeliumThe 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
mendeleviumThe chemical element of atomic number 101, a radioactive metal of the actinide series. It does not occur naturally and was first made in 1955 by bombarding einsteinium with helium ions