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

Options

A. `K^(+) , Ca^(2+),Sc^(3+),Cl^(-)`
B. `Na^(+),Ca^(2+),Sc^(3+),F^(-)`
C. `K^(+),Cl^(-),Mg^(2+),Sc^(3+)`
D. `Na^(+),Mg^(2+),Al^(3+),Cl^(-)`

Answer

A

Explanation

Species which have same no. of electrons are said to be isoelectronic species.