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Certain sub shells of an atom are given below. 2s, 2d, 3f, 3d, 5s, 3p 

a. Which are the sub shells that are not possible? 

b. Give the reason.

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a. Not possible sub-shells are 2d, 3f 

b. d – sub shell is not possible in 2nd shell 

f – sub shell is not possible in 3rd shell

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