Question

If n, l, m and s represent the symbols of quantum numbers, the impossible quantum number set for the electron in terms of n, l, m and s respectively is

• A. 2, 0, -1, +1/2
• B. 3, 0, 0, -1/2
• C. 4, 1, +1, +1/2
• D. 3, 2, -1, -1/2

Hint:

The most common errors in quantum number sets involve the 'l' and 'm' values. Always check them sequentially: first, is 'l' valid for the given 'n'? Second, is 'm' valid for the given 'l'? This structured check helps to quickly spot the error.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
Identify invalid set of quantum numbers.

Step 2: Key Rules (Alternate):
For given l, m ranges from -l to +l inclusive. l=0 → m must be 0 only.

Step 3: Detailed Explanation:
(2,0,-1,+1/2): l=0 but m=-1. Violates rule m∈[-l,+l]. Others satisfy rules.

Step 4: Final Answer:
(2,0,-1,+1/2) is impossible.