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Question

Maximum number of electrons that can be present in M and N shells respectively are:

A
18,32
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B
8,18
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C
32,50
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D
32,48
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Solution

The correct option is A 18,32
Maximum number of electrons that can be present in M and N shells are 8,18 respectively.
M shell corresponds to n=3. So, 2n2 and total 18 electrons are possible in M shell.
N shell corresponds to n=4. It has 4s, 4p and 4d subshells. s subshell has 2 electrons, p subshell has 6 electrons and d subshell has 10 electrons. . So, 2n2 total 32 electrons are possible in N shell.

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