Cu^{2+} will have the following electronic configuration:
(1) 1s^{2}, 2s^{2}, 2p^{6}, 3s^{2}, 3p^{6}, 3d^{10},
(2) 1s^{2}, 2s^{2}, 2p^{6}, 3s^{2}, 3p^{9}, 4s^{1}
(3) 1s^{2}, 2s^{2}, 2p^{6}, 3s^{2}, 3p^{6}, 3d^{9},
(4) 1s^{2}, 2s^{2}, 2p^{6}, 3s^{2}, 3p^{6}, 3d^{10}, 4s^{1}
Ans: 1s^{2}, 2s^{2}, 2p^{6}, 3s^{2}, 3p^{6}, 3d^{9},