Classification of Elements and Periodicity in Properties - Result Question 45
####45. The electronic configuration of four elements are given below. Which element does not belong to the same family as others?
[1989]
(a) $[Xe] 4 f^{14} 5 d^{10} 1 s^{2}$
(b) $[Kr] 4 d^{10} 5 s^{2}$
(c) $[Ne] 3 s^{2} 3 p^{5}$
(d) $[Ar] 3 d^{10} 4 s^{2}$
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Solution:
- (c) 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.
