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What is the co-ordination number of c...

What is the co-ordination number of calcium in `CaF_(2)` ?

A

6

B

4

C

8

D

2

Text Solution

Verified by Experts

The correct Answer is:
B
`Na_(2)O` has antifluorite structure `O^(2-)` ions constitute ccp lattice while `Na^(+)` ions occupy the tetrahedral voids. Each `O^(2-)` ion is in contact with 8 `Na^(+)` ions and each `Na^(+)` ion is in contact with `4O^(2-)` ions. The C.N. of sodium in `Na_(2)O=4`
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