Question

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.

Answer 1

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 = ?

Formula:

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

Calculation:

From formula,

Since the radius ratio **** in between 0.225 – 0.414

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