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The charge to size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species \( \mathrm{K}^{+}, \mathrm{Ca}^{2+} \), \( \mathrm{Mg}^{2+} \), and \( \mathrm{Be}^{2+} \) ?
(a) \( \mathrm{Ca}^{2+}\mathrm{Mg}^{2+}\mathrm{Be}^{+}\mathrm{K}^{+} \)
(b) \( \mathrm{Mg}^{2+}\mathrm{Be}^{2+}\mathrm{K}^{+}\mathrm{Ca}^{2+} \)
(c) \( \mathrm{Be}^{2+}\mathrm{K}^{+}\mathrm{Ca}^{2+}\mathrm{Mg}^{2+} \)
(d) \( \mathrm{K}^{+}\mathrm{Ca}^{2+}\mathrm{Mg}^{2+}\mathrm{Be}^{2+} \)
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