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29 August, 09:08

In which main energy level does the 's' sublevel first appear? K (first main energy level) L (second main energy level) M (third main energy level) N (fourth main energy level)

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  1. 29 August, 09:53
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    1. B, because in the 1s you don't have a p orbital, only in 2p, so the second level.
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