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Certain subshells of an atom are given b...

Certain subshells of an atom are given below. 2s,2d,3f,3d,5s,3p: Which are the subshells that are not possible? Give the reason.

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a) 2d, 3f
b) In 2d, .2. indicates shell number. The `2^nd` shell contains s and p subshell only. Similarly the 3rd shell consists of s,p and d subshell only. Hence 2s and 2f subshells are not possible.
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