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Sodium metal crystallizes in body centre...

Sodium metal crystallizes in body centred cubic lattice with the cell edge, `a=4.29Å`. What is the radius of sodium atom?

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In bcc arrangement of atoms: 4 r = `sqrt(3)`a atoms on body diagonal remain in contact.
`rArr " " r = (sqrt(3)a)/(4) = (sqrt(3) xx 4.29)/(4) = 1.86` Å
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