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Sorry to post again so soon but Im having troubles with a new question...

With hexagonal closest packaging, cubic closest packaging and body centred... which of these three types of packaging has the least efficient arrangement of atoms, and why?

Though I do not know forsure, since my book has literally taught me NOTHING on this subject.. by looking atthe pictures and volumes (if they were put into a tight box) I would say hexagonal is the least effieient, since it holds 13 atoms, as does cubic packaging... however the volume of the hexagonal packaging would be larger than the cubic packaging. (assuming 1 unit per sphere- hexagonal 27, and cubic- 18.75 (since not all spehere take up a full space of the sphere due to the pattern. The body-centred only holds 12, and has a smaller volume of 12. I am really confused about this topic, quite possibly I am going about this ALL wrong.. If any one could help you'd be AWESOME!!!! THANKS A LOT!!!

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# Packing of particles

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