Given below are the quantum numbers for 4 electrons:

A. (3d)
B. (4p)
C. (4d)
D. (3p)

The correct order of increasing energy is:

Question

Given below are the quantum numbers for 4 electrons:

A.  (3d)
B.  (4p)
C.  (4d)
D.  (3p)

The correct order of increasing energy is:

Canvas Classes · Accepted Answer

Use  rule for multielectron atoms:

| Electron |  |  |  | Subshell |
|----------|-----|-----|-------|----------|
| D | 3 | 1 | 4 | 3p |
| A | 3 | 2 | 5 | 3d |
| B | 4 | 1 | 5 | 4p |
| C | 4 | 2 | 6 | 4d |

When  is same (A and B both have ): lower  has lower energy → 3d (A) < 4p (B)

Energy order: 3p < 3d < 4p < 4d

Answer: Option (2)

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