In calcium fluoride, having the fluorite structure, the coordination numbers for calcium ion (Ca2+) and fluoride ion (F-) are

  • Option 1)

    4 and 2

  • Option 2)

    6 and 6

  • Option 3)

    8 and 4

  • Option 4)

    4 and 8

 

Answers (1)

As we learnt in 

No. of atoms(z) for face centered unit cell -

Lattice points: at corners and face centers of unit cell.

For face centered cubic (FCC), z=4.

- wherein

 

The calcium ions in C{a}F_{2} occupy all corners and face centres of the cube. Each Ca  atom is surrounded by  8 F atoms.  

F atoms occupy all tetrahedral sites. Each F atom is surrounded by 4  Ca atoms.

Correct option is 3.


Option 1)

4 and 2

This option is incorrect.

Option 2)

6 and 6

This option is incorrect.

Option 3)

8 and 4

This option is correct.

Option 4)

4 and 8

This option is incorrect.

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