Question

In fluorite structure :-

• A. $C{a}^{+2}$ ions are ccp and $F^{-}$ ions are in octahedral voids
  
• B. $C{a}^{+2}$ ions are ccp and $F^{-}$ ions are in tetrahedral voids
  
• C. $C{a}^{+2}$ ions are in bcc and $F^{-}$ ions are in cubical voids
  
• D. $F^{-}$ ions are ccp and $C{a}^{+2}$ ions are in tetrahedral voids

Answer 1

The correct option is B $C{a}^{+2}$ ions are ccp and $F^{-}$ ions are in tetrahedral voids


In Fluorite structure $C{a}^{+2}$ ions adopt ccp arrangement while $F^{-}$ ions are in all tetrahedral holes as represented in the structure below.