Chloride ion and potassium ion are isoelectronic. Then

Options

A. their sizes are same
B. chloride ion is bigger than potassium ion
C. potassium is relatively bigger
D. depends on the other cation or anion

Answer

B

Explanation

`Cl^(-)` ion has 17 protons in the nucleus while `K^(+)` has 19 protons. The nuclear charge of `K^(+)` is greater and therefore its size ios smaller.