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JEE Main 2012 Chemistry question

ChemistryStructure of AtomJEE Main 2012

The electrons identified by quantum numbers n and l : (a) n = 4, l = 1 (b) n = 4, l = 0 (c) n = 3, l = 2 (d) n = 3, l = 1 Can be placed in order of increasing energy as:

Answer: (2)

Solution

(n + l) rule (lower n first for equal n + l): (d) 3p: 4; (b) 4s: 4 (higher n); (c) 3d:

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Question ID VK-103746