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If ionic radic radii of Cs^(+) and Ce^(-...

If ionic radic radii of `Cs^(+)` and `Ce^(-)`are `1.69Å` and `181Å`respectively, the edge length of unit cell is

A

`4.04Å`

B

`3.50Å`

C

`7.00Å`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
Cube diagonal
`2(r^(+)+r^(-))=sqrt3a`
`2(1.69+1.81)=sqrt3a`
`a=(2(1.69+1.81))/sqrt3Å=4.04Å`
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