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In which order do the 5s, 4d and 5p orbitals increase in energy?
A5s < 4d < 5p
B4d < 5s < 5p
C5p < 4d < 5s
D5s < 5p < 4d
Answer & Solution
Correct answer: A. 5s < 4d < 5p
By the n + l rule 5s (5) fills first, then 4d (6) before 5p (6) since 4d has the lower n.
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