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in Chemistry by (87.4k points)

The two ions A+ and B have radius 58 and 210 pm respectively in closed packed crystal of compound AB. Predict the coordination number of A+

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Given: Radius of Cation A+ (r+ ) = 58 pm 

Radius of anion B (r ) = 210 pm 

To find: The coordination number of AB = ?

Formula: 

Radius ratio=  Radius of the cation/Radius of the anion

Calculation: 

From formula, 

Radius ratio

Since the radius ratio lies in between 0.225 – 0.414 

The coordination number of AB is 4 

And the structure of AB is Tetrahedral 

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