List of top Chemistry Questions on packing efficiency asked in BITSAT

Each edge of a cubic unit cell is 400 pm long. If the atomic mass of the element is 120 and its density is 6.25 g cm⁻³, the crystal lattice is:
(Use \(N_A = 6 \times 10^{23}\) mol⁻¹)
An elemental crystal has a density of \(8570\,\text{kg m}^{-3}\). The packing efficiency is 0.68. The closest distance of approach between neighbouring atoms is \(2.86\,\text{\AA}\). What is the mass of one atom approximately?
The fraction of total volume occupied by the atoms present in a simple cube is: