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Density of lithium atom is 0.53 g/cm3. The edge length of Li is 3.5 Ao. The number of lithium atoms in a unit cell will be ___________ (Atomic mass of lithium is 6.94)

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answer is 2.

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Detailed Solution

p=0.53g/cm3,a=3.5Å,Z=?,M=6.94p=Z×Ma3×No ∵a=3.5×10−8cm0.53=z×6.943.5×10−83×6.02×1023Z=1.9≈2Z=2

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