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Question

The maximum number of electrons that can be filled in the shell with the principal quantum number n=3 is

A
18
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B
9
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C
8
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D
2
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Solution

The correct option is A 18
Maximum number of electrons that can be filled with the principal quantum number n=2×n2.

Here, n=3

Maximum number of electrons that can be accommodated in this shell =2×9=18

Therefore, option A is correct.

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