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

Options

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

Answer

C

Explanation

Isoelectronic species are those which have same number of electrons `K ^(+), Ca ^(2+), Sc ^(3-) and Cl ^(-)` have 18 electrons.