By X-ray studies, the packing of atoms in a crystal of gold is found to be in layers such that starting from any layer, every fo

By X-ray studies, the packing of atoms in a crystal of gold is found to be in layers such that starting from any layer, every fourth layer is found to be exactly identical . The density of gold is found to be `19.4 g cm^(-3)` and its atomic mass is 197 a.m.u.
The approximate number of unit cells present in 1 g of gold is
A. `3.06xx10^21`
B. `1.53xx10^21`
C. `3.82xx10^20`
D. `7.64xx10^20`

By X-ray studies, the packing of atoms in a crystal of gold is found to be in layers such that starting from any layer, every fourth layer is found to

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