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If the radius of \( \mathrm{Mg}^{2+} \) ion, \( \mathrm{Cs}^{+} \)ion, \( \mathrm{O}^{2-} \) ion, \( \mathrm{S}^{2-} \) ion and \( \mathrm{Cl}^{-} \)ion are \( 0.65 \AA, 1.69 \AA, 1.40 \AA, 1.84 \AA \), and \( 1.81 \AA \) respectively. Calculate the co-ordination numbers of the cations in the crystals of \( \mathrm{MgS}, \mathrm{MgO} \) and \( \mathrm{CsCl} \)
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