The correct order of ionic radii for the ions, P3–, S2–, Ca2+, K+, Cl– is : vk;uksa P3–, S2–, Ca2+, K+, Cl– ds fy, vk;fud f=kT;ksa dk lgh Øe gS & (A) P3– S2 Cl– K+ Ca2+ (B) P3– S2 Cl– Ca

Question

The correct order of ionic radii for the ions, P3–, S2–, Ca2+, K+, Cl– is : vk;uksa P3–, S2–, Ca2+, K+, Cl– ds fy, vk;fud f=kT;ksa dk lgh Øe gS &

(A) P3– > S2 > Cl– > K+ > Ca2+
(B) P3– > S2 > Cl– > Ca2+ > K+
(C) Cl– > S2 > P3– > Ca2+ > K+
(D) K+ > Ca2+ > P3– > S2– > Cl–

Prashant Kotian · Accepted Answer

Correct answer: A. P3– S2– Cl– K+ Ca2+ Z 16 19 No. of e– 18 18 For isoelectronic species greater is Z smaller is radius. So correct order P3– > S2– > Cl– > K+ > Ca2+

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