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If the radii of Mg^(2+), Cs^(o+), O^(2-)...

If the radii of `Mg^(2+), Cs^(o+), O^(2-), S^(2-)`, and `CI^(Θ)` ions are `0.65, 1.69, 1.40, 1.84`, and `1.81 Å`, respectively, calculate the coordination number of the cation in the crystals of `MgS, MgO`, and `C_(s)CI`.

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4,6,8
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