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Q.
The electronic configuration of four elements are given below. Which elements does not belong to the same family as others?
Classification of Elements and Periodicity in Properties
Solution:
Elements (a), (b) and (d) belong to the same group
since each one of them has two electrons in the s sub shell.
In contrast, element (c) has seven electrons in the valence
shell and hence does not lie in the same group in which
elements (a), (b) and (d) lie