Question

give the coordination number of -

1. cubic close packing
2.hexagonal close packing

Answer 1

cubic close packing:

The face-centered cubic (fcc) has a coordination number of 12 and contains 4 atoms per unit cell. The body-centered cubic (bcc) has a coordination number of 8 and contains 2 atoms per unit cell. The simple cubic has a coordination number of 6 and contains 1 atom per unit cell.

Hexagonal close packing:

The hexagonal closest packed (hcp) has a coordination number of 12 and contains 6 atoms per unit cell. The face-centered cubic (fcc) has a coordination number of 12 and contains 4 atoms per unit cell. The body-centered cubic (bcc) has a coordination number of 8 and contains 2 atoms per unit cell.

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Answer 2

ANSWER;'___✍️

1). Cubic close packing (CCP):

Coordination number= 12 and

packing efficiency= 74%

2). Hexagonal close packing (HCP):

Coordination number= 12 and

Packing efficiency 74%✓

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