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

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

`2.0^(@)A`

B

`5.6.^(@)A`

C

`2.8.^(@)A`

D

`3.8.^(@)A`

Text Solution

Verified by Experts

The correct Answer is:
1
Edge length `(a)=2(r_(c)+r_(a))`
`2r_(a)=a-2r_(c),r_(a)=(a-2r_(c))/(2)`
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