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Sodium metal crystallises in bec lattice...

Sodium metal crystallises in bec lattice with the cell edge 'a=4.29 `A^(circ)` .' What is the radius of sơdium atom?

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For bcc lattioe `r=a sqrt3/4=sqrt3/4` xx 4.29 xx 10^-10=1: 86 A^(circ)`
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