The electronic configuration of Cu is-

Options

A. `[Ne]3s^(2)3p^(6)3d^(9)4s^(2)`
B. `[Ne]3s^(2)3p^(6)3d^(10)4s^(1)`
C. `[Ne]3s^(2)3p^(6)3d^(3)4s^(2)4p^(6)`
D. `[Ne]3s^(2)3p^(6)3d^(5)4s^(2)4p^(4)`.

Answer

B

Explanation

Applying Hunds rule and Aufbau principle, electronic configuration of Cu will be: `[Ne]3s^(2)3p^(6)3d^(10)4s^(1)`.