Question

Which one of the following statements about packing in solids is incorrect ?

• A. Coordination number in bcc mode of packing is 8
• B. Coordination number in hcp mode of packing is 12
• C. Void space in hcp mode of packing is 32%
• D. Void space in ccp mode of packing is 26%

Answer 1

Answer: (C)

The hcp arrangement of atoms occupies 74% of the available space and thus has 26% vacant space.