Question

In $Caf_{2}$type (fluorite sluorite structure) $Ca^{2 +}$ions form \underline{(A)}Structure and $F^{-}$ions present in all \underline{(B)}voide. The coordination number of $Ca^{2 +}$is \underline{(C)}and $F^{-}$is \underline{(D)}.

(1),(2),(3) and (4) respectively are

A B C D

• A. ccp octahedral 8 4
• B. bcc tetrahedral 4 8
• C. ccp tetrahedral 8 4
• D. ccp octahedral 4 8

Answer 1

Answer: (C)

ccp tetrahedral 8 4

Answer 2

$Ca^{2 +}$ions from ccp structure While $F^{-}$ions are in all tetrahedral holes and coordination number are 8 and 4.