The total number of electrons that can fit in the $M$ shell ($n=3$) is
A$8$
B$10$
C$32$
D$18$
Answer & Solution
Correct answer: D. $18$
Maximum electrons in shell $n$ is $2n^2$. For $n=3$: $2 \cdot 9 = 18$. Made up of $3s^2 + 3p^6 + 3d^{10}$.
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