$C s B r$ possess bcc structure. The edge length of unit cell is $400 p m$ . Find out the interionic distance.

346.4 p m

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200 p m

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300 p m

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100 p m

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Solution

The correct option is A $346.4 p m$
For BCC $r = \frac{\sqrt{3}}{2} a$
$r^{+} + r^{-} = \frac{\sqrt{3}}{2} a$
$r^{+} + r^{-} = \frac{\sqrt{3} \times 400}{2}$
$∴ r^{+} + r^{-} = 346.4 p m$

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