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NEET2023ChemistryStructure of AtomActual

Which one of the following represents all isoelectronic species?

Options

  1. ANa ⁺, Mg ²⁺, O ⁻, F ⁻
  2. BCa ²⁺, Ar , K ⁺, Cl ⁻
  3. CNa ⁺, Cl ⁻, O ⁻, NO ⁺
  4. DN ₂ O , N ₂ O ₄, NO ⁺, NO

Correct answer

B. Ca ²⁺, Ar , K ⁺, Cl ⁻

Step-by-step solution

(2) Ca ²⁺=20-2=18 e ⁻ aligned & Ar =18 e ⁻ & K ⁺=19-1=18 e ⁻ & Cl ⁻=17+1=18 e ⁻ aligned So, Ca ²⁺, Ar , K ⁺ and Cl ⁻ are isoelectronic species.

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