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For which one of the following sets of four quantum numbers, an electron will have

For which one of the following sets of four quantum numbers, an electron will have the highest energy?n=3, l=2, m=1, s=1/2

Options

(a) n=4, l=2, m=-1, s=1/2
(b) n=4, l=1, m=0, s=-1/2
(c) n=5, l=0, m=0, s=-1/2
(d) n=4, l=2, m=-1, s=1/2

Correct Answer:

n=4, l=1, m=0, s=-1/2

Explanation:

The sub-shell are 3d, 4d, 4p and 4s, 4d has highest energy as n + l value is maximum for this.

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