Give the general electronic configuration valence shell of 'd' block elements
1
\(n{d^{1 - 10}}\left( {n - 1} \right){s^{1 - 2}}\)
2
\(\left( {n - 1} \right){d^{1 - 10}}n{s^{1 - 2}}\)
3
\(\left( {n - 1} \right){d^{1 - 5}}n{s^2}\)
4
\(\left( {n - 1} \right){d^{10}}n{s^2}\)