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what is the radius of sodium atom if it ...

what is the radius of sodium atom if it crystaliizes in bcc structure with the cell edge of 400 pm?

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The correct Answer is:
19.4 ` g//cm^(3) ,` 143.9 pm
For BCC, ` r = sqrt3/4 a = 1.732/4 xx 400 = 173.2 ` pm
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