Question

Name the d-subshells which successively get filled in the three series of transition elements.

Answer 1

The d-subshells that successively get filled in the three series of transition elements are:

1. 3d subshell: In the first transition series (Scandium to Zinc, atomic numbers 21-30)
2. 4d subshell: In the second transition series (Yttrium to Cadmium, atomic numbers 39-48)
3. 5d subshell: in the third transition series (Lanthanum/Hafnium to Mercury, atomic numbers 57/72-80)