What will be the position of an electron in an atom when (n+1) value is same for two Sub-shells?
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Since electrons cannot have the same set of quantum numbers, a maximum of two can be in the n = 1 level, and a third electron must reside in the higher-energy n = 2 level. If there are two electrons in the n = 1 level, their spins must be in opposite directions. (More precisely, their spin projections must differ.)
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