1.

Predict the structure of MgO crystal and the co-ordination number of the cation in which the radii of the cation and anion are 65 pm and 140 pm respectively.

Answer» Radius ratio, `(r^(+))/(r^(-))=(("65pm"))/(("140pm"))=0.464`
Since the radius ratio falls in the range `0.414-0.732`, the co-ordination of the cation is 6 and its expected structure is octahedral.


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