Sodium metal crystallizes in a body centred cubic lattice with a unit cell edge of 4.29 Å. The radius of sodium atom is approximately :

Engineering

Chemistry

Ionic Solids and Crystal Structure

Question

0.93 Å

5.72 Å

3.22 Å

1.86 Å

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$r = \frac{\sqrt{3} \times 4 .29}{4} ≅ 1 .86 Å$