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Sodium metal crystallises in a body-cent...

Sodium metal crystallises in a body-centreed cubic lattice with a unit cell edge of 4.29Å. The radius of sodium atom is approximately-

A

1.86 Å

B

3.22 Å

C

5.72 Å

D

0.93 Å

Text Solution

Verified by Experts

The correct Answer is:
A
For body-centred unit cell, r = `sqrt3/4a`.
Therefore, the radius of Na-atom = `sqrt3/4xx4.29Å=1.86Å`.
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