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How many electron states are in these su...

How many electron states are in these subshells: (a) `n=4,l=3`, (b) `n=3,l=2,` (c ) `n=4,l=1,` (d) `n=2,l=0`?

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(a) 14, (b) 10, (c ) 6, (d) 2
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