In the calcium fluoride structure, the coodination number of the cation and the anion are, respectively,

Options

A. `6,6`
B. `4,4`
C. `8,4`
D. `4,8`

Answer

C

Explanation

The `Ca^(2+)` ions are arranged is (ccp) arrangement i.e. `Ca^(2+)` ions are present at all corners and at the tetrahadral since , this is `8:4` arrangement i.e. each `Ca^(2+)` ion is surrounded by `8F` ions and each `F` ion by four `Ca^(2+)` ions.