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  4. In the calcium fluoride structure the coordination number of the cation and anions are respectively

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Q. In the calcium fluoride structure the coordination number of the cation and anions are respectively

AMUAMU 2007

Solution:

In calcium fluoride structure, the $Ca ^{2+}$ ions are arranged in ccp (cubic closed packed) arrangement, $i e, Ca ^{2+}$ ions are present at all corners and the centre of each face of the cube. The fluoride ions occupy all the tetrahedral sites. This is $8: 4$ arrangement ie, each $Ca ^{2+}$ ion is surrounded by $8 F ^{-}$ions and each $F ^{-}$ion by four $Ca ^{2+}$ ions.