MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
At most how many electrons can the "M" level hold?
Think it through first, then pick an option.
- a 2
- b 8
- c 18
- d 32
Answer and explanation
Correct answer: c 18
For M, n = 3, so 2n² = 2 × 9 = 18.
Why the other options are wrong
- a 2: 2 is the K shell's capacity; M (n = 3) holds 2 × 3² = 18.
- b 8: 8 is the L shell's capacity; M holds at most 18.
- d 32: 32 is the N shell's capacity; M holds at most 18.
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