Which set of quantum numbers is not permitted?
- A. n equals 2, l equals 1, m equals 0
- B. n equals 3, l equals 2, m equals minus 2
- C. n equals 2, l equals 2, m equals 1
- D. n equals 1, l equals 0, m equals 0
Explanation
The azimuthal quantum number can never equal or exceed n, so l equal to 2 is impossible when n is 2, which would describe a non existent 2d orbital. The other three sets satisfy every restriction. Checking l against n first, then m against l, catches almost every invalid set.
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