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  • I need help with The coordination number of CaF2 type structure is

The coordination number of CaF2 type structure is

  • Option 1)

    1 : 2

  • Option 2)

    4 : 4

  • Option 3)

    4 : 8

  • Option 4)

    8 : 4

 

Answers (1)

In CaF2 crystal each Ca2+ ion is surrounded by 8 F- ion and each F- ion is surrounded by 4 Ca2+ ion.

 

Fluoride structure -

{Ca^{2+}} arrange in CCP

{F^{-}} found in all tetrahedral voids

Edge length = \frac{4}{\sqrt{3}} (r_{Ca^{2+}} + r_{F^{-}})

Coordination Number = 8 : 4

 

- wherein

Number of {Ca^{2+}} = 4

Number of {F^{-}} = 8

Number of CaF_{2} molecule per unit cell = 4

Ex :  SrF_{2} , BaF_{2} , MgCl_{2}

 

 


Option 1)

1 : 2

This is incorrect

Option 2)

4 : 4

This is incorrect

Option 3)

4 : 8

This is incorrect

Option 4)

8 : 4

This is correct

Posted by

subam

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