Per NCERT §2.6.1, the principal quantum number n takes which values, and what does it primarily determine?
An = −1, 0, +1 — determines orientation
Bn = 0, 1, 2, … — determines spin
Cn = ½, 1, 3/2 — determines shape
Dn = 1, 2, 3, … — determines size and (largely) energy of the orbital; identifies shell K, L, M, N…
Answer & Solution
Correct answer: D. n = 1, 2, 3, … — determines size and (largely) energy of the orbital; identifies shell K, L, M, N…
Per NCERT §2.6.1, n is a positive integer 1, 2, 3, … — fixes size + energy + shell letter (K = 1, L = 2, M = 3, N = 4).
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