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JEE Main2004ChemistryStructure of AtomActual

Which one the following sets of ions represents the collection of isoelectronic species?

Options

  1. AK ⁺, Ca ²⁺, Sc ³⁺, Cl ⁻
  2. BNa ⁺, Mg ²⁺, Al ³⁺, Cl ⁻
  3. CK ⁺, Cl ⁻, Mg ²⁺, Sc ³⁺
  4. DNa ⁺, Ca ²⁺, Sc ³⁺, F ⁻

Correct answer

A. K ⁺, Ca ²⁺, Sc ³⁺, Cl ⁻

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