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Question

In the context of periodicity, elements in the same group tend to display similar chemical properties. Which primary factor is responsible for this similarity among group members?

This question was previously asked in
RRB NTPC 2025 Graduate CBT 2 Question Paper PDF (10-Jul-2026) (Shift 1)
The correct answer is

Similar valence electronic configuration

Elements in the same group display similar chemical properties primarily because they share a similar valence electronic configuration.

Identical atomic numbers, similar atomic masses, and constant atomic radius do not correctly explain this shared chemical behaviour among group members.

Hence, 'Similar valence electronic configuration' is the correct answer.

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