\( \mathrm{K}^{+}, \mathrm{Cl}^{-}, \mathrm{Ca}^{2+} \), and \( \mathrm{S}^{2-} \) ions are isoe...
\( \mathrm{K}^{+}, \mathrm{Cl}^{-}, \mathrm{Ca}^{2+} \), and \( \mathrm{S}^{2-} \) ions are isoelectronics. The decreasing order of their size is:
(a) \( \mathrm{S}^{2-}\mathrm{Cl}^{-}\mathrm{K}^{+}\mathrm{Ca}^{2+} \)
(b) \( \mathrm{Ca}^{2+}\mathrm{K}^{+}\mathrm{Cl}^{-}\mathrm{S}^{2-} \)
(c) \( \mathrm{K}^{+}\mathrm{Cl}^{-}\mathrm{Ca}^{2+}\mathrm{S}^{2-} \)
(d) \( \mathrm{Cl}^{-}\mathrm{S}^{2-}\mathrm{Ca}^{2+}\mathrm{K}^{+} \)
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