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  • Give answer! In an ionic crystal the radius of cation is 102 pm and radius of anion is 203 pm then type of void occupied by cation is

In an ionic crystal the radius of cation is 102 pm and radius of anion is 203 pm then type of void occupied by cation is

  • Option 1)

    Triangular

  • Option 2)

    Tetrahedral

  • Option 3)

    Octahedral

  • Option 4)

    Cubical

 

Answers (1)

best_answer

\frac{radius\; of\; cation}{radius\; of\; an ion}=\frac{102}{203}=0.502

The ratio of radius of cation to radius of anion is in between 0.414 to 0.732 so the cation occupy octrahedral void.

 

 

Radius ratio of cation and anion -

Radius ratio  Void
0.155 to 0.225 triangular
0.225 to 0.414 tetrahedral
0.414 to 0.732 octahedral
0.732 to 1 cubical

 

- wherein

Ex : B_{2}O_{3} , ZnS , CaF_{2} , Na_{2}O , NaCl , KCl , FeO , CsCl

 

 


Option 1)

Triangular

This is incorrect

Option 2)

Tetrahedral

This is correct

Option 3)

Octahedral

This is incorrect

Option 4)

Cubical

This is incorrect

Posted by

Plabita

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