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The Solid State
Question
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An ionic compound AB2 possess CaF2 type crystal structure. What the co-ordination number of A2+ and B– ions in crystal of AB2 explain.

Answer

CaF is partof bcc inwhich the Ca2+ is located at the body centred F- is located atthe corners of the unit cell thus co-ordination numberof Ca2+ is 8 and co-ordination number of F- is 4. similarly in AB2   The co-ordination number of A2+ is 8, whereas B- ion co-ordination number is 4.

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