The packing efficiency of a body-centred cubic (bcc) unit cell is
A. 52.4%
B. 34%
C. 68%
D. 74%
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Answer: C. 68%
In bcc, \(4r=\sqrt3a\); two atoms occupy \(\frac{2\cdot\frac43\pi r^3}{a^3}\approx0.68\) of the cell.
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· 23 Oct 2026
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