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Physics 13 Online
OpenStudy (anonymous):

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

OpenStudy (anonymous):

1K=1s 2L=2s/2p 3M=3s/3p/3d 4N=4s/4p/4d/4f

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