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In an ionic compound, anions form hcp arrangement and cations exactly fit into tetrahedral voids. The distance between two closely packed layers is Å, then what would be the radius of the cation in picometer?

In an ionic compound, anions form hcp arrangement and cations exactly fit into tetrahedral voids. The distance between two closely packed layers is Å, then what would be the radius of the cation in picometer?

Grade:12

1 Answers

Priyanshu Gujjar
101 Points
one month ago
In ccp or hcp packing there is one octahedral void corresponding to each atom constituting the close packing. In the compound, only 2/3rd of the octahedral voids are occupied. It means corresponding to each anion is 2/3 cations. The whole number ratio of A and C in compound is, therefore, 3:2 Hence the formula of the compound is C2A3.

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