Which of the following sets of ions repr...

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

`K^(+),Cl^(-),Mg^(2+),Sc^(3+)`

`Na^(+),Ca^(2+),SC^(3+),F^(-)`

`K^(+),Ca^(2+),Sc^(3+),Cl^(-)`

`Na^(+), Mg^(2+),Al^(3+), Cl^(-)`

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The correct Answer is:

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

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