Question

The co-ordination no. of F- in CaF2 is :-
(1) 3 (2) 4 (3) 6 (4) 8

Answer 1

Answer on Question #41370 - Chemistry - Other

Question:

The co-ordination no. of F- in CaF2 is :-

(1) 3 (2) 4 (3) 6 (4) 8

Answer: (2) 4

The fluorite $\mathrm{CaF}_2$ has the crystal lattice in which the vertices are ions $\mathrm{Ca}^{2+}$ and $\mathrm{F}^{-}$ . The fluorine ions are surrounded with $4\mathrm{Ca}^{2+}$ ions, so the coordination number of fluorine is 4.

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