In The Calcium Fluoride Structure, The Coordination Number Of The Cation And Anion Are Respectively

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Question

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

4, 4
6, 6
4, 8
8, 4

medium

Solution

Correct option is

8, 4

The Ca²⁺ ions are arranged in (ccp) arrangement, ie, Ca²⁺ ions are present at all corner and the centre of each face of the cube. The fluoride ions occupy all the tetrahedral sites. This is 8:4 arrangements, ie, Ca²⁺ ion is surrounded by 8F^- ions and each F^- ion by four Ca²⁺ ions.