`f-`block elements (sometimes called inner transition elements) are the elements in which the last electron enters the_____________orbitals.

Options

A. `nf`
B. `(n -1)f`
C. `(n -2)f`
D. `(n -3)f`

Answer

C

Explanation

`f`-transition elements are elements in which the last electron enters the `f`-subshell of their repective antepenultimate shells, i.e., in these elements, the second form the outermost occuied shell is build from `18` to `32` electrons. All are metals.