Which one of the following sets of ions represents a collection of iso

1.	Which one of the following sets of ions represents a collection of isoelectronic species ?
Answer» `N^(3-),O^(2-),F^(-),S^(2-)` `LI^(+),NA^(+),Mg^(+2),Ca^(+2)` `K^(+),Cl^(-),Ca^(+2),Sc^(+3)` `BA^(+2),Sr^(+2),K^(+2),Ca^(+2)` Answer :C

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