Identify the type of unit cell containing a single particle.

Which of the following crystal systems has $a = b = c$ and $\alpha = \beta = \gamma \neq 90^o$?

Which of the following crystal systems does not possess an axis of rotation?

The crystal system of a compound with unit cell dimensions $a = 0.387 \ nm$,$b = 0.387 \ nm$ and $c = 0.504 \ nm$ and $\alpha = \beta = 90^{\circ}$ and $\gamma = 120^{\circ}$ is:

State the characteristics of a crystal lattice.

$CdS$ crystallizes in which type of crystal system?