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The metal calcium crystallizes in a face...

The metal calcium crystallizes in a face centred cubic unit cell with a = 0.556 nm. Calculate the density of the metal if
it contains `0.2%` Frenkel defect

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The Frenkel defects do not change the density because the number of atoms per unit cell remains the same `d=zxxM//(a^3xxN_A)=1.5463 g cm^-3`, density is not changed in Frenkel defect.
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