Which of the following should be the possible sub-shells, for n + l = 7 ?
(a) 7s, 6p, 5d, 4f
(b) 4f, 5p, 6s, 4d
(c) 7s, 6p, 5d, 6d
(d) 4s, 5d, 6p, 7s
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Sry don't know..........
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