Which of the following electronic configurations is of transition elements?

Options

A. `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)4s^(2)`
B. `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(2)4p^(1)`
C. `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(2)4p^(6)`
D. `1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(2)4s^(2)`

Answer

D

Explanation

Since last electron enter in d-orbital, it is a transition element.