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The electronic configuration of four elements are given below. Which element does not belong to same family as others?
  1. [Xe] 6s2 4f14 5d10
  2. [Kr] 5s24d10
  3. [Ne] 3s2 3p5
  4. [Ar] 4s2 3d10


Solution

The correct option is C [Ne] 3s2 3p5
Elements having the same number of valence electrons belong to the same group.
[Xe]6s24f145d10, [Kr]5s24d10 and [Ar]4s23d10 belong to the same group since each one of them have two electrons in the outermost shell. In contrast, [Ne]3s23p5has 7 electrons in the outermost shell. Hence, it belongs to a different group.

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