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Question:

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

3.22

5.72

1.86

0.93

Solution:

In bcc structure, the radius of sodium atom is 0.433a = 0.433 × 4.29 Å = 1.86 Å