The number of atoms per unit cell in a primitive cubic unit cell is ........ .

Most crystals show good cleavage because their atoms,ions or molecules are

Which of the following represents the correct axial distances and axial angles for the rhombohedral crystal system?

Among the following,the crystal system which includes end-centered is

Chromium metal crystallises in a body-centred cubic $(bcc)$ lattice. The edge length of the unit cell is found to be $287 \, pm$. The atomic radius of chromium will be ............. $pm$.

The unit cell present in the crystal lattice of diamond is