Ga (atomic mass \( 70 \mathrm{u} \) ) crystallizes in a hexagonal close packed structure. The to...

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Ga (atomic mass \( 70 \mathrm{u} \) ) crystallizes in a hexagonal close packed structure. The total number of voids in \( 0.581 \mathrm{~g} \) of Ga is \( \times 10^{21} \).
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