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Predict the structure of MgO crystal and coordination number of its cation in which the cation and anion radii are equal to 65 pm and 140 pm respectively. |
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Answer» Solution :Radius of cation (`Mg^(2+)`) = 65 pm. Radius of anion (`O^(2-)`) = 140 pm Radius ratio, `(r_(+))/(r_(-))=(r_(Mg^(2+)))/(r_(O^(2-)))=(65)/(140) =0.464` The radius ratio lies between 0.414-0.732. HENCE the EXPECTED structure is octahedral with coordination number of SIX. |
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