transactinide elements(trăns'ăk`tənīd'), in chemistry, elements with atomic numbers greater than that of lawrencium (at. no. 103), the last member of the actinide series. See transuranium elementstransuranium elements,
in chemistry, radioactive elements with atomic numbers greater than that of uranium (at. no. 92). All the transuranium elements of the actinide series were discovered as synthetic radioactive isotopes at the Univ.
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transactinide elements[tranz′ak·tə‚nīd ‚el·ə·məns]
In the periodic table, elements with atomic numbers higher than 103.