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

Options

A. `K^(+) ,C1^(-) ,Mg^(2+) , Sc^(3+)`
B. `Na^(+) , Ca^(2+) , Sc^(3+) , F^(-)`
C. `K^(+) , Ca^(2+) , Sc^(3+) , C1^(-)`
D. `Na^(+) , Mg^(2+) ,A1^(3+) ,C1^(-)`

Answer

C

Explanation

`K^(+) (19 - 1= 18 ) . C1^(-) (17 + 1= 18) .`
`Ca^(2+) (20- 2 =18) , Sc^(3+) (21 = 3=18)` represent a collection of isoelectronic species.