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

Options

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

Answer

A

Explanation

Each has ` 18` electrons.