Solid StateHard

Question

Silver (atomic mass = 108) has an atomic radius of 144 pm and density 10.6 g/ cm3. To which type of cubic crystal silver belongs?

Options

A.Simple
B.BCC
C.FCC
D.End-centred

Solution

Packing fraction = $\frac{\left( 6 \times 10^{23} \right) \times \frac{4}{3}\pi \times \left( 144 \times 10^{- 10} \right)}{\left( \frac{108}{10.6} \right)} = 0.736$

Hence, the crystal should be FCC.

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