Which among the following electronic configurations belong to main group elements?A. [Ne]3s^1 B. [Ar]3d^3 4s^2 C. [Kr]4d^105s^2 5p^5 D. [Ar]3d^104s^1 E. [Rn]5f^0 6d^2 7s^2Choose the correct answer from the option given below :

1. B and E only

2. A and C only

3. D and E only

4. A, C and D only

Doubtly Asked 30 Oct 2026 NEET UG 2025 Practice test neet Save WhatsApp Report

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Best answer

Answer: 2. A and C only

Key idea: main group elements are s- and p-block elements; d-block elements have d electrons being filled.

A: \([\mathrm{Ne}]3s^1\) is Na, s-block (main group).
B: \([\mathrm{Ar}]3d^34s^2\) is V, d-block.
C: \([\mathrm{Kr}]4d^{10}5s^25p^5\) is I, p-block (main group).
D: \([\mathrm{Ar}]3d^{10}4s^1\) is Cu, d-block.
E: \([\mathrm{Rn}]5f^06d^27s^2\) is Rf, d-block.

A and C only: option (2).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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