Question

The atomic number of $Ni$ and $Cu$ are $28$ and $29$ respectively. The electronic configuration $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}$ represents

• A. $Ni$
• B. $N{i}^{2+}$
• C. $C{u}^{2+}$
• D. $C{u}^{+}$

Answer 1

Answer: (D)

Electronic configuration of $Ni$ (At no. $=28$ ) and $Cu$ (At. no. $=29$ ) is $Ni=1s^2,2s^{2}2p^6,3s^{2}3p^{6}3d^8,4s^2$ $Cu=1s^2,2s^{2}2p^6,3s^{2}3p^{6}3d^{10},4s^1$ Hence, $1s^2,2s^{2}2p^6,3s^{2}3p^{6}3d^{10},4s^0$ electronic configuration shown by $C{u}^{+}$ ion.