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-1

The ionic radii (VI coordination) increases from $\ce{Zn^2+}(\pu{0.74 Å)}$ to $\ce{Cd^2+}(\pu{0.95 Å)}$ to $\ce{Hg^2+}(\pu{1.02Å)}$. Applying Fajans' rule, the expected order of covalent character: $$\ce{ZnCl2} > \ce{CdCl2} > \ce{HgCl2}$$ But consider the following properties: Water solubility order (per $\pu{100 g}$ at $\pu{20 °C})$: $$\ce{ZnCl2}~(\...


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Consider the figure given in the previous answer: Due to a lone pair of $\ce{e-}$ and thus, due to lp-bp repulsions, all equatorial fluorine atoms will move upwards but still remain in a plane. Now, the $\ce{Br}$ will be out of that plane. This will cause the $\ce{F_{axial}-Br-F_{equatorial}}$ angle to reduce. I think $\ce{F_{equatorial}-Br-F_{equatorial}}$ ...


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