1. Tardigrade
  2. Question
  3. Chemistry
  4. 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

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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

NTA AbhyasNTA Abhyas 2020The Solid State

Solution:

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