The chemical element of atomic number 98 a radioactive metal of the actinide series first produced by bombarding curium with helium ions
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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
lawrenciumThe chemical element of atomic number 103, a radioactive metal of the actinide series. Lawrencium does not occur naturally and was first made by bombarding californium with boron nuclei
technetiumThe chemical element of atomic number 43, a radioactive metal. Technetium was the first element to be created artificially, in 1937, by bombarding molybdenum with deuterons
einsteiniumThe chemical element of atomic number 99, a radioactive metal of the actinide series. Einsteinium does not occur naturally and was discovered in 1953 in debris from the first hydrogen bomb explosion