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Explain giving reaons, which of the sets...

Explain giving reaons, which of the sets of quantum number are not possible ?
`n =0 " " l = 0" " m _(l) = 0 " " m _(s) = + 1//2`

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`n =0 " " l = 0" " m _(l) = 0 " " m _(s) = + 1//2`
This set is not possible because n is never equal to zero
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