1.Using the radius ratio, predict the type of hole where the Mg2+ ion is present in the MgS crystal lattice. The ionic radius of Mg2+ is 0.86 Å and the ionic radius of S2- is 1.70 Å. a.cubic b.trigonal c.octahedral d.tetrahedral 2. Which one of the following substances crystallizes as an ionic solid? a.CH3OH b.SiO2 c.K2O d.Sn

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