Q. 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) $Cu^{+}$
B) $Cu^{2 +}$
C) $Ni^{2 +}$
D) $Ni$
Explanation
(a)
Electronic configuration of
$\ _{28}Ni = 1s^{2},2s^{2}2p^{6},3s^{2}3p^{6}3d^{8},4s^{2}$
$Ni^{2 +} = 1s^{2},2s^{2}2p^{6},3s^{2}3p^{6}3d^{8},4s^{0}$
$\ _{29}Cu = 1s^{2},2s^{2}2p^{6},3s^{2}3p^{6}3d^{10},4s^{1}$
$Cu^{+} = 1s^{2},2s^{2}2p^{6},3s^{2}3p^{6}3d^{10},4s^{0}$
So, the given configuration is of $Cu^{+}$.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.