Question

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

• A. $Cu^{+}$
• B. $Cu^{2+}$
• C. $Ni^{2+}$
• D. $Ni$

Answer 1

Answer: (A)

$Cu^{+}$

Answer 2

Electronic configuration of

$_{28}Ni = 1s^2, \,2s^2 \,2p^6, \, 3s^2\,3p^6\,3d^8, \,4s^2$
$Ni^{2+} = 1s^2, \,2s^2\,2p^6, \,3s^2 \,3p^6\, 3d^8, \,4s^0$
$_{29}Cu = 1s^2 ,\,2s^2\,2p^6 ,3s^2\,3p^63d^{10} ,\,4s^1$
$Cu^+ = Is^2,\, 2s^2\,2p^6, 3s^2\,3p^6\,3d^{10}, \,4s^0$

So, the given configuration is of $Cu^+$