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If the radius of Br^(-) ion is 0.20 nn, ...

If the radius of `Br^(-)` ion is 0.20 nn, how large can a cation be fit in its tetrahedral holes ?

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The correct Answer is:
0.0753 pm
For tetrahedral void, `r^(+)//r^(-)=0.225-0.414`
`r^(+)=(0.414)xxr^(-)` (For maximum radius of cation) ltBrgt `r^(+)=(0.414xx0.182"pm")=0.0753"pm"`. ltbr. Thus, cation of radius 0.0753 pm (maximum) can fit into each tetrahedral void.
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