Which metal among the following has the highest packing efficiency?
A
Iron
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B
Tungsten
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C
Aluminium
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D
Polonium
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Solution
The correct option is D Aluminium The packing efficiency is is the fraction of volume in a crystal structure that is occupied by constituent particles (volume of space occupied by the spheres/total volume). The majority of metals take on either the hcp or bcc structure. Among the given metals Al occupies hexagonal close-packed (hcp) is having 0.74 packing efficiency and other metals form body-centered cubic (bcc) which has 0.68 packing efficiency.