Question

Write electronic configuration of Cu metal (Z=29) and Cr^3+ ion.

Answer 1

$1s ^{2} 2s ^{2} 2p ^{6} 3s ^{2} 3p ^{6} 4s ^{1} 3d ^{10}$
Is the elctronic configuration of Cu metal.

Answer 2

Cu = 1s^2 , 2s^2 , 2p^6 , 3s^2 , 3p^6 , 4s^1 , 3d^10.
Cr^3+ = 1s^2 , 2s^2 , 2p^6 , 3s^2 , 3p^6 , 3d^3 .