Electronic configuration of Cu(Z = 29) is - Vidyadip

MCQ

Electronic configuration of $Cu(Z = 29)$ is

A
$[Ar]3{d^9}4{s^2}$
✓
$[Ar]3{d^{10}}4{s^1}$
C
$[Ar]3{d^5}4{s^2}$
D
$[Ar]3{d^6}4{s^2}$

✓

Answer

Correct option: B.

$[Ar]3{d^{10}}4{s^1}$

b
(b)The expected electronic configuration of $ Cu (29)$ is $[Ar]\;3{d^9}4{s^2}$ but actually it is found to be $[Ar]\;3{d^{10}}4{s^1}$. This is because fully filled $d$ orbitals are more stable than incompletely filled $d-$ orbitals. So there is a migration of one ${e^ - }$, from $4s $ orbital to $3d$ orbital to give a more stable configuration.

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