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

Options

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

Answer

A

Explanation

In case of (A), each ion contains `1.8e^(-)s` .