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NEET2025Chemistry
Q.

Which among the following electronic configurations belong to main group elements?

A. [Ne]3s    B. [Ar]3d4s

C. [Kr]4d5s5p    D. [Ar]3d4s

E. [Rn]5f6d7s

Choose the correct answer from the option given below:

  1. A

    B and E only

  2. B

    A and C only

  3. C

    D and E only

  4. D

    A, C and D only

Solution

Main group elements have their outermost electrons in - or -orbitals (s-block + p-block).

A: [Ne]3s → s-block (Na). Main group.

C: [Kr]4d5s5p → p-block (I, iodine). Main group.

B and D have unfilled or filled -subshells as outermost feature → d-block (transition metals).

E has 6d7s → also d/f-block region (actinide-related).

Only A and C.

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