Question

Potassium crystallizes in a body-centered cubic lattice, and has a density of 0.856 g/cm3 at 25oC.

a. how many atoms are there per unit cell?

b. What is the length of the side of the cell?

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Answer 1

Answer:

In a body-centered cubic lattice all atoms touch each other.

∴

3

a=4r ⟹r=2.21

Distance between the nearest neighbours is 2r2r for one atom present at corner and one atom present at the body center.

Therefore, the nearest distance between atoms is 2r=4.42

Explanation:

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