Which among the following electronic configurations belong to main group elements?A. [Ne]3s1 B. [Ar]3d34s2C. [Kr]4d105s25p5 D. [Ar]3d104s1E. [Rn]5f06d27s2Choose the correct answer from the options givenbelow:

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Chemistry

Answer

Main Group Electron Configurations

Main group = elements whose valence shell involves only s or p subshells (Groups 1–2, 13–18).

  • Configuration A ([Ne] 3s¹) corresponds to Na, an s-block metal.
  • Configuration C ([Kr] 4d10 5s2 5p5) is I (iodine), a p-block halogen.

Configurations B and D possess 3d electrons, and E (Th) has 6d/5f involvement — so none are main-group.

Therefore, the only main-group configurations listed are A and C, making Option 2 the correct choice.

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