Actinide series, a series of radioactive metallic elements in Group 3 of the periodic table. Members of the series are often called actinides, although actinium (Ac, atom no. 89) is not always...
Actinide series are in period 7, starts after Actinium(89) next with atom numbers 90 till 103, in group 3'A': the 5f suborbital is 'fiiled up' with 0-14 electrons. Uranium (92) is the most known and...