(C) The correct electronic configuration of $Cu$ $(Z=29)$ is $[Ar] 4s^1 3d^{10}$ due to the extra stability of the fully filled $d$-subshell.Option $C

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$Cu (Z=29): [Ar] 4s^2 3d^9$ (represented as $4s: \uparrow \downarrow, 3d: \uparrow \downarrow, \uparrow \downarrow, \uparrow \downarrow, \uparrow \downarrow, \uparrow$)

(C) The correct electronic configuration of $Cu$ $(Z=29)$ is $[Ar] 4s^1 3d^{10}$ due to the extra stability of the fully filled $d$-subshell.Option $C$ shows the configuration as $4s^2 3d^9$,which is incorrect for the ground state of $Cu$.

Class 11 Chemistry Structure of Atom Quantum number, Electronic configuration and Shape of orbitals

Medium

Which of the following is not correct for the electron distribution in the ground state for $4s$ and $3d$ orbitals?

AIIMS 1982 All AIIMS

A
$Co (Z=27): [Ar] 4s^2 3d^7$ (represented as $4s: \uparrow \downarrow, 3d: \uparrow \downarrow, \uparrow \downarrow, \uparrow \downarrow, \uparrow, \uparrow$)
B
$Ni (Z=28): [Ar] 4s^2 3d^8$ (represented as $4s: \uparrow \downarrow, 3d: \uparrow \downarrow, \uparrow \downarrow, \uparrow \downarrow, \uparrow, \uparrow$)
C
$Cu (Z=29): [Ar] 4s^2 3d^9$ (represented as $4s: \uparrow \downarrow, 3d: \uparrow \downarrow, \uparrow \downarrow, \uparrow \downarrow, \uparrow \downarrow, \uparrow$)
D
$Zn (Z=30): [Ar] 4s^2 3d^{10}$ (represented as $4s: \uparrow \downarrow, 3d: \uparrow \downarrow, \uparrow \downarrow, \uparrow \downarrow, \uparrow \downarrow, \uparrow \downarrow$)