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How many electrons in an atom may have t...

How many electrons in an atom may have the following quantum numbers?
(a) ` n=4 , m_(s) =-1//2` (b) n=3 , l=0

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a. `2n^(2)=2xx4^(2)=32`
But only one spin`=32/2=16e^(-)`
b. `3s, s` can have only `2e^(-)`
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