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The Solid State — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe Solid State1 Mark
MCQ
Which metal among the following has the highest packing efficiency?
  • A
    Iron
  • B
    Tungsten
  • ✓
    Aluminium
  • D
    Polonium
✓

Answer

Correct option: C.
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 $\text{hcp}$ or $\text{bcc}$ structure. Among the given metals Al occupies hexagonal close$-$packed $(\text{hcp})$ is having $0.74$ packing efficiency and other metals form body$-$centered cubic $(\text{bcc})$ which has $0.68$ packing efficiency.

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