Question

Which Subshell is represented by the lanthanides series?

Answer 1

1. The elements in which the last electron is received in the $f$orbitals are called $f$-block elements. Their common electronic configuration is$(n-2)f^{1-14}(n-1)d^{0-1}n{s}^2$.
2. f-block consists of two series.
   I) Lanthanides series consists of $14$ elements following Lanthanum.
   II) Actinide series consists of $14$ elements following Actinium.
3. Lanthanides series consists of the elements in which the last electron is received in one of the 4$f$ orbitals.
4. Hence, the 4$f$ subshell represents the Lanthanides series.