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Using the formula for shell capacity, what is the maximum number of electrons the M shell (n = 3) can hold?
A8
B18
C2
D32
Answer & Solution
Correct answer: B. 18
1. Shell capacity is given by $2n^2$.
2. For the M shell, $n = 3$.
3. Capacity $= 2 \times 3^2 = 2 \times 9 = 18$.
4. Rule out A (8 is the L shell) and C (2 is the K shell).
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 2 "Periodic Classification of Elements", p.33_
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