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Question

Chemistry Question on properties of d block elements

The species Ar,K+ {Ar, K^+} and Ca2+ {Ca^{2+}} contain the same number of electrons. In which order do their radii increase?

A

\ceCa2+<K+<Ar\ce{Ca^{2+} < K^+ < Ar }

B

\ceK+<Ar<Ca2+\ce{K^+ < Ar < Ca^{2+} }

C

\ceAr<K+<Ca2+\ce{Ar < K^+ < Ca^{2+} }

D

\ceCa2+<Ar<K+\ce{Ca^{2+} < Ar < K^+ }

Answer

\ceCa2+<K+<Ar\ce{Ca^{2+} < K^+ < Ar }

Explanation

Solution

Atomic radius and ionic radius 1Zeffective\propto \frac{1}{Z_{effective}}