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The correct increasing order of the ionic radii is 

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The correct increasing order of the ionic radii is 

(1) Cl- < Ca2+ < K+ < S2+

(2) K2- < Cl- < Ca2+ < K+

(3) S2- < Cl- < Ca2+ < K+

(4) Ca2+ < K+ < Cl- < S2-

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(4) Ca2+ < K+ < Cl- < S2-

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