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. Assuming gold atom to be spherical , its radius will be

By X-ray studies, the packing of atoms in a crystal of gold is found t

1.	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. Assuming gold atom to be spherical , its radius will be
Answer» 203.5 PM 143.9 pm 176.2 pm 287.8 pm SOLUTION :For fcc, `r=a/(2SQRT2)`=0.3535 a =0.3535 x 407 pm =143.9 pm