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Q71 (NDA-II/2021) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Atomic and nuclear physics

What is the maximum number of electrons in the M-Shell ?

Result
Your answer: —  ·  Correct: C
Explanation

The maximum number of electrons that can be accommodated in a shell is determined by the formula 2n², where 'n' represents the principal quantum number or the shell number. The shells are designated alphabetically starting from the nucleus as K (n=1), L (n=2), M (n=3), and N (n=4). For the M-shell, the principal quantum number n is 3. Applying the formula, the maximum capacity is calculated as 2 × (3)² = 2 × 9 = 18 electrons. This capacity is distributed across three subshells: the 3s (2 electrons), 3p (6 electrons), and 3d (10 electrons) orbitals. While the octet rule states that the outermost shell of an atom cannot have more than 8 electrons during chemical stability, the total theoretical capacity of the third (M) shell remains 18.

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