The species Ar, K+ and Ca2+ contain the same number of electrons. In which order do their radii increase ?

Question

The species Ar, K⁺ and Ca²⁺ contain the same number of electrons. In which order do their radii increase ?

Ca²⁺ < K⁺ < Ar

K⁺ < Ar < Ca²⁺

Ar < K⁺ < Ca²⁺

Ca²⁺ < Ar < K⁺

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