NEET2007ChemistryClassification of Elements and Periodicity in PropertiesActual
Identify the correct order of the size of the following:
Options
- ACa ²⁺ < K ⁺ < Ar < Cl ⁻ < S ²⁻
- BAr < Ca ²⁺ < K ⁺ Cl ⁻< < S ²⁻
- CCa ²⁺ < Ar < K ⁺ < Cl ⁻ < S ²⁻
- DCa ²⁺ < K ⁺ < Ar < S ²⁻ < Cl ⁻
Correct answer
A. Ca ²⁺ < K ⁺ < Ar < Cl ⁻ < S ²⁻
Step-by-step solution
For isoelectronic species, size of anion increases as negative charge increases whereas size of cation decreases with increase in positive charge. Further ionic radii of anions is more than that of cations. Ca ²⁺ < K ⁺ < Ar < Cl ⁻ < S ²⁻