World 1 · Atoms in a repeating cell · 8 minSpace between atoms
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In a hard-sphere model, packing fraction is N(4πr³/3)/a³. At contact, simple cubic fills 52.36%, BCC 68.02% and FCC 74.05%. Reducing the displayed radii leaves more empty space but does not change how many lattice sites belong to a cell.
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Which of these is most densely packed?
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