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Determine the structure and coordination number of MgS on the basis of radius ratio in which radius of Mg2+ and S2– is 65 pm and 184 pm respectively. 

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Given: Radius of cation Mg2+ (r+ ) = 65 pm 

Radius of anion S2− (r ) = 184 pm

To find: i. The coordination number of MgS = ?

ii. Structure of MgS = ?


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


From formula,

Since the radius ratio lies in between 0.225 – 0.414 

The coordination number of MgS is 4. And the structure of MgS is Tetrahedral. 

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