Question

Which of the following is electronic configuration of $C{u}^{2+}(Z=29)$?

• A. $[Ai]4s^{1}3d^8$
• B. $[Ar]4s^{1}3d^{10}4p^1$
• C. $[Ar]4s^{1}3d^{10}$
• D. $[Ar]3d^9$

Answer 1

Answer: (D)

$Cu:1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^1$.
$\therefore C{u}^{2+}:1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{9}or[Ar]3d^9$