The last electron placed in the third \( (n=3) \) quantum shell for: (A) \( \mathrm{Kr} \) (B) \...

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The last electron placed in the third \( (n=3) \) quantum shell for:
(A) \( \mathrm{Kr} \)
(B) \( \mathrm{Zn} \)
(C) \( \mathrm{Cu} \)
(D) \( \mathrm{Ca} \)
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