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

What is a crystal lattice? How is it formed?

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 ............. $pm$.

Distinguish between
$(i)$ Hexagonal and monoclinic unit cells
$(ii)$ Face-centred and end-centred unit cells.

For an orthorhombic crystal system,the axial lengths are $a \neq b \neq c$. What are the axial angles?

Select the incorrect statement.