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How many electron in an atom may ha...

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

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( a) n=-4` :. ` Total electron `=2n^(2)`
half of the 32 - `m_(s ) ` of 16 electrons `=(1)/(2)`
( b) n=3 and l=0
3s orbital
3s orbital have only 2 electrons
Number of electron =2 heving n= 3 and l=2
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