Compare the energies of following sets of quantum numbers for a multielectron system:
(A) (4p)
(B) (4d)
(C) (3p)
(D) (3d)
(E) (4s)

Choose the correct answer:

Question

Compare the energies of following sets of quantum numbers for a multielectron system:
(A)  (4p)
(B)  (4d)
(C)  (3p)
(D)  (3d)
(E)  (4s)

Choose the correct answer:

Canvas Classes · Accepted Answer

For multielectron atoms, use  rule:

| Orbital |  |  |  | Energy rank |
|---------|-----|-----|-------|-------------|
| (C) 3p | 3 | 1 | 4 | Lowest |
| (E) 4s | 4 | 0 | 4 | Same n+l as 3p, but lower n → 3p < 4s |
| (D) 3d | 3 | 2 | 5 | — |
| (A) 4p | 4 | 1 | 5 | Same n+l as 3d, but lower n → 3d < 4p |
| (B) 4d | 4 | 2 | 6 | Highest |

Energy order (increasing): 3p < 4s < 3d < 4p < 4d

Answer: Option (4)

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