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NEET levelSingle correct optionDifficulty 1 of 3as198

The ground-state electronic configuration of copper ( $Z = 29$ ) is

A $[Ar] 3 d^{9} 4 s^{2}$
B $[Ar] 3 d^{10} 4 s^{2}$
C $[Ar] 3 d^{10} 4 s^{1}$
D $[Ar] 3 d^{8} 4 s^{2} 4 p^{1}$

Answer: C

A fully filled

3 d^{10}

subshell is specially stable (symmetry and exchange energy), so one

4 s

electron moves to

3 d

. Cu is

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

.

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