$FeSO_4 \cdot 7H_2O$ shows isomorphism with

The crystal system with edge lengths $a \neq b \neq c$ and axial angles $\alpha = \beta = \gamma = 90^{\circ}$ is '$x$' and the number of Bravais lattices for it is '$y$'. $x$ and $y$ are:

Identify the type of unit cell containing a single particle.

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

$CdS$ crystallizes in which type of crystal system?

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