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

Options

A. `N^(3-),O^(2-),F^(-) ,S^(2-)`
B. `Li^(+),Na^(+),Mg^(2+),Ca^(2+)`
C. `K^(+),Cl^(-),Ca^(2+),Sc^(3+)`
D. `Ba^(2+),Sr^(2+),K^(+),Ca^(2+)`

Answer

C

Explanation

`K^(+) (19-1=18), Cl^(-) (17+1=18) , Ca^(2+) (20-2=18)` and `Sc^(3+) (21-3=18)` represents a collection of isoelectronic species.