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Maximum no of electron is found out by 2n^2 rule (n=>shell no).
In this case n is 3
Hence it is 18
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How many electrons can a orbit holding can be done by formula 2n^2 and where as n= orbit. here you gave 3 orbit ,n=3 so it can hold electrons

2×3^2=2×9=18 and that is the answer
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