General valence shell electronic configuration of `f-`block elements is

Options

A. `(n -2)f^(1-14)(n-1)^(1-10) ns^(2)`
B. `(n -2)^(0-14)(n-1)^(0-10) ns^(0-2)`
C. `(n -2)f^(1-14)(n-1)d^(0-1) ns^(2)`
D. `(n -2)f^(0-14)(1-1)d^(0-2) ns^(2)`

Answer

D

Explanation

Thorium is the only `f`-block element which has no `(n - 2)f` electron.