The maximum number of electrons in electronic configuration can be calculated by using formula: · Atomic Structure MDCAT Past Paper MCQ

Chemistry Atomic Structure MDCAT 2016

PMDC Verified Question 85 of 95

The maximum number of electrons in electronic configuration can be calculated by using formula:

$ 2l + 1 $

$ 2n^2 $

$ 2n^2 + 2 $

$ 2n^2 + 1 $

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Official Correct Choice:

Option B: $ 2n^2 $

Concept: The total number of electrons that can be accommodated in a principal energy level (shell) depends solely on its principal quantum number $n$.

Formula: $$ \text{Max Electrons per Shell} = 2n^2 $$

Solution:

For $ n=1 $ (K shell): $ 2(1)^2 = 2 $
For $ n=2 $ (L shell): $ 2(2)^2 = 8 $
For $ n=3 $ (M shell): $ 2(3)^2 = 18 $
This standard formula aggregates the capacities of all subshells within the $ n^{th} $ shell.

Why other options are incorrect: $ 2l+1 $ calculates the number of orbitals in a subshell, not the maximum electrons in a principal shell.

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