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Question

Among the following, the orbital that has the lowest energy is________.

A
5f
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B
4f
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C
6s
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D
6p
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Solution

The correct option is A 6s
E(n+l)...Aufbau's rule

(n+l) for 5f,4f,6s,6p are (5+3),(4+3),(6+0),(6+1) i.e., 8,7,6,7 respectively.

Thus 6s has the lowest energy among these.

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