Question

when atoms are placed at the corners of all 12 edges how many atoms present in per unit cell. Explain?

Answer 1

Answer:

Explanation:Dear student

 

Atoms are present at corner.

no. of atoms = 8 * 1/8 = 1

 

it has 12 atoms at its edge and each contributes 1/4th so 12 * ¼ = 3

 

edge centres cubic unit cell has 4  atoms per unit cell

Answer 2

When atoms are placed at the corners of all 12 edges, there will be  3 atoms per unit cell.

• In the given question, the atoms are placed at the corners of 12 edges. The contribution of 1 atom placed at the corner of the edge is 1/4.
• Now, let us assume that there are x atoms in the unit cell. So, the value of x will be, x = 12*1/4 = 3
• Hence, there will be a total of 3 atoms present per unit cell when the atoms are placed at the corners of 12 edges.

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