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2p and 3s both have n + l = 3. Which has lower energy, and why?
A3s, because it is larger
BThey have equal energy
C2p, because its n is lower
D3s, because n is higher
Answer & Solution
Correct answer: C. 2p, because its n is lower
When n + l values tie, the orbital with the lower n has lower energy, so 2p lies below 3s.
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