Four ions that are isoelectronic with one another have the following experimentally…

CHEMISTRY · Single correct · CBSE · Chemistry · Classification of Elements and Periodicity in Properties · Classification of Elements and Periodicity in Properties

Problem

Four ions that are isoelectronic with one another have the following experimentally determined ionic radii: A = 184 pm, B = 171 pm, C = 136 pm, D = 118 pm. The ions present are S²⁻, Cl⁻, K⁺, and Ca²⁺. Which assignment of ions to radii is most consistent with periodic trends? (a) A=Cl−,  B=S2−,  C=K+,  D=Ca2+A = \mathrm{Cl^-},\; B = \mathrm{S^{2-}},\; C = \mathrm{K^+},\; D = \mathrm{Ca^{2+}} (b) A=S2−,  B=Cl−,  C=K+,  D=Ca2+A = \mathrm{S^{2-}},\; B = \mathrm{Cl^-},\; C = \mathrm{K^+},\; D = \mathrm{Ca^{2+}} (c) A=Ca2+,  B=K+,  C=Cl−,  D=S2−A = \mathrm{Ca^{2+}},\; B = \mathrm{K^+},\; C = \mathrm{Cl^-},\; D = \mathrm{S^{2-}} (d) A=K+,  B=Ca2+,  C=S2−,  D=Cl−A = \mathrm{K^+},\; B = \mathrm{Ca^{2+}},\; C = \mathrm{S^{2-}},\; D = \mathrm{Cl^-}

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