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NEET Chemistry QUESTION #1105
Question 1
Which among the following electronic configurations belong to main group elements? A. [Ne]3s\(^1\) B. [Ar]3d\(^3\)4s\(^2\) C. [Kr]4d\(^{10}\)5s\(^2\)5p\(^5\) D. [Ar]3d\(^{10}\)4s\(^1\) E. [Rn]5f\(^0\)6d\(^2\)7s\(^2\)
  • D and E only
  • A, C and D only
  • B and E only
  • A and C only✔️
Correct Answer Explanation
Main group elements have their valence electrons in s or p orbitals only. A: [Ne]3s\(^1\) = Na (Group 1, s-block) ✓. B: [Ar]3d\(^3\)4s\(^2\) = Vanadium (d-block, transition metal) ✗. C: [Kr]4d\(^{10}\)5s\(^2\)5p\(^5\) = Iodine (Group 17, p-block) ✓. D: [Ar]3d\(^{10}\)4s\(^1\) = Cu (d-block) ✗. E: [Rn]5f\(^0\)6d\(^2\)7s\(^2\) = Th (d/f-block) ✗. Main group: A and C only.