Free JEE Main Chemistry Electronic Configuration MCQs with step-by-step solutions (2 questions). Part of Atomic Structure. Practise online on Prepizo — no login needed.
Q1 — Electronic Configuration · easy · numerical
The maximum number of electrons in the M shell (n = 3) is:
A. 8
B. 18 ✓ Correct
C. 32
D. 2
Solution: The maximum electrons in a shell is 2n². For n = 3: 2 × 3² = 18.
Q2 — Electronic Configuration · medium · theory
Which orbital is NOT possible?
A. 2s
B. 2d ✓ Correct
C. 3p
D. 4f
Solution: For n = 2, l can only be 0 (s) or 1 (p). A d orbital needs l = 2, which requires n ≥ 3, so 2d does not exist.