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Edge length of `M^(+)X^(-)` (fcc structure) is `7.2^(@)A`. Assuming `M^(+)-X^(-)` contact along the cell edge, radius of `X(-)` ion is `(r_(M+)=1.6^(@)A)`:
A. `2.0A^(@)`
B. `5.6A^(@)`
C. `2.8A^(@)`
D. `3.8A^(@)`

1 Answer

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Best answer
Correct Answer - A
`2(r_(M^(+))+r_(X^(-)))=7.2`
`2(1.6+r_(X^(-)))=7.2`
`r_(X^(-))=1.0 Å`

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