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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 ?
`n=3,m_(s)=-1//2`

Text Solution

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No. of orbitals in `3^("rd")` shell `=n^(2)=3^(2)=9`
Since each orbital contains only one electron with `m_(s)=-(1)/(2)`, there will be total 18 electrons and 9 electrons will be with `m_(s)=+(1)/(2)`.
Hence, there will be 9 electrons with `m_(s)=-(1)/(2)`
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