In fluorite structure (.CaF2)-

Question

In fluorite structure (.CaF2)- (A) Ca2 + ions form ccp & F- ions are present in all the tetrahedral voids (B) Ca2 + ions form ccp & F- ions are present in all the octahedral voids (C) Ca2 + ions form ccp & F- ions are present in half of the octahedral voids and the rest half ions in the tetrahedral voids (D) None

Tardigrade Admin · Accepted Answer

Ca2 + ions form ccp and F- ions are present in the tetrahedral voids. So, the no. of Ca2 + ions is 4 and no. of F- ions is 8. So, the formula of the Calcium fluoride Ca4F8 or, the simplest formula of calcium fluoride is CaF2 .

Q. In fluorite structure $(C a F_{2}) -$

$C a^{2 +}$ ions form ccp & $F^{-}$ ions are present in all the tetrahedral voids

$C a^{2 +}$ ions form ccp & $F^{-}$ ions are present in all the octahedral voids

$C a^{2 +}$ ions form ccp & $F^{-}$ ions are present in half of the octahedral voids and the rest half ions in the tetrahedral voids

None

$C a^{2 +}$ ions form ccp and $F^{-}$ ions are present in the tetrahedral voids. So, the no. of $C a^{2 +}$ ions is 4 and no. of $F^{-}$ ions is 8.
So, the formula of the Calcium fluoride $C a_{4} F_{8}$ or, the simplest formula of calcium fluoride is $C a F_{2}$ .

Q. In fluorite structure (CaF2​)−

Ca2+ ions form ccp & F− ions are present in all the tetrahedral voids

Ca2+ ions form ccp & F− ions are present in all the octahedral voids

Ca2+ ions form ccp & F− ions are present in half of the octahedral voids and the rest half ions in the tetrahedral voids