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In an ionic solid r_(c)=1.6Å and r_(a)=1.86Å.Find edge length of cubic unit cell is Å

Answer»


Solution :`(r_(C))/(r_(a))=0.858`
From above ratio it is CLEAR that cation OCCUPY cubic void in simple cubic unit cell, HENCE
`SQRT(3)a=2(r_(c)+r_(a))`
`a=4`


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