The packing fraction of the element that crystallizes in simple cubic arrangement is:

Q. The packing fraction of the element that crystallises in simple cubic arrangement is :

Q. A crystal arrangement is formed such that it consists of Aatoms forming cubic close packing and B occupy all the octahedral voids. Assuming no distortion, calculate packing efficiency of the crystal. Express answer in nearest integer percentage:
[Use :$[1+(0.414{)}^3]=1.07,\frac{\pi }{3\sqrt{2}}=0.74]$

Q. An element crystallizes in 3-D hexagonal closed packed structure. Packing fraction of the lattice is :

Q. A solid element exists in simple cubic crystal. If its atomic radius is $1.0\stackrel{o}{A}$ and the ratio of packing fraction to density is $0.1c{m}^3/g,$ then the atomic mass of the element is $(N_A\approx 6\times {10}^{23})$

Q. Calculate the packing fraction for unit cell of an element 'X', given that it crystallizes in a face- centred cubic unit cell.