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Shape and Geometry Using VSEPR

Rbl crystalli...

Question

Rbl crystallizes in bcc structure in which each rubedium ion surrounded by eight iodide ions each of radius $2.17 ˚ A$ . Find the length of one side of RbI unit cell :

4.34

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8.68

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12.12

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None of the above

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Solution

The correct option is D None of the above
The information given in insufficient, the radii of both cation and anion is required to find out the edge length of a unit cell.
For BCC lattices ,
$\sqrt{3} a = 2 (r_{+} + r_{-})$
Here radius of cation is unknown.

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