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How the formula of a compound can be known on the basis of voids filled in a lattice structure ? |
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Answer» Solution : In a close packed structure, the number of tetrahedral VOIDS are equal to twice of number of spheres while the number of octahedral voids are equal to number of spheres. In ionic SOLIDS, bigger ions i.e. usually the ANIONS form the close packed structure and the smaller ions usually the cations occupy the voids. If the cation is SMALL in size, it occupies tetrahedral voids and if it octahedral voids. In a GIVEN compound, the fraction of tetrahedral or octahedral voids that are occupied depends on the chemical formula of the compound. |
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