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Edge length of M^(+)X (fcc structure) is...

Edge length of `M^(+)X` (fcc structure) is `7.2Å`. Assuming (`M^(+) - X^(-))` contact along the cell edge, radius of `X^(-)` ion is (`r_(M+) = 1.6Å):`

A

`2.0Å`

B

`5.6Å`

C

`2.8Å`

D

`38Å`

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