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

Chemistry · JEE Main · NTA Exams — Classification of Elements and Periodicity in Properties

1. \(\left(\mathrm{Li}^{+}, \mathrm{Na}^{+}, \mathrm{Mg}^{2+}, \mathrm{Ca}^{2+}\right.\)
2. \(\left(\mathrm{Ba}^{2+}, \mathrm{Sr}^{2+}, \mathrm{K}+, \mathrm{Ca}^{2+}\right.\)
3. \(\left(\mathrm{N}^{3-}, \mathrm{O}^{2-}, \mathrm{F}^{-}, \mathrm{S}^{2-}\right.\)
4. \(\left(\mathrm{K}^{+}, \mathrm{Cl}^{-}, \mathrm{Ca}^{3+}, \mathrm{Sc}^{3+}\right.\)

Answer

(D) ( K ^ + , Cl ^ - , Ca ^ 3+ , Sc ^ 3+ .

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