Which of the following statements is/are correct about hexagonal close packing? 1. the coordination number is 8 2. It is ABAB type packing in which third layer is aligned with the first layer 3. Be, Mg, Mo etc. are found to have hcp structure 4. In hcp, atoms occupy 74% of the available space

Question

Which of the following statements is/are correct about hexagonal close packing? 1. the coordination number is 8 2. It is ABAB type packing in which third layer is aligned with the first layer 3. Be, Mg, Mo etc. are found to have hcp structure 4. In hcp, atoms occupy 74% of the available space (A) 2, 3 (B) 3, 4 (C) 2, 3, 4 (D) 1, 2, 3

Tardigrade Admin · Accepted Answer

In hexagonal close packing coordination number is 12 not 8 hence statement 1 is incorrect. Rest are correct here.

Q. Which of the following statements is/are correct about hexagonal close packing? 1. the coordination number is 8 2. It is ABAB type packing in which third layer is aligned with the first layer 3. Be, Mg, Mo etc. are found to have hcp structure 4. In hcp, atoms occupy 74% of the available space

2, 3

3, 4

2, 3, 4

1, 2, 3

In hexagonal close packing coordination number is 12 not 8 hence statement 1 is incorrect. Rest are correct here.