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The electronic configurations of four elements are given below. Which element does not belong to the same family as others?

1. [Xe]4f14 5d10 6s2
2. [Kr]4d10 5s2
3. [Ne]3s2 3p5
4. [Ar]3d10 4s2

Correct answer: [Ne]3s2 3p5

Solution

Option C ([Ne]3s2 3p5) represents a halogen, while the others belong to different groups (A and B are transition metals, and D is a d-block element). Thus, C does not belong to the same family.

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