When atoms are placed at the corners of all $12$ edges of a unit cell,what is the number of atoms present per unit cell?

Which of the following crystal systems exists only as a primitive Bravais lattice?

Identify the crystal system in which a primitive unit cell has edge lengths $a = b = 200 \text{ pm}$ and $c = 300 \text{ pm}$ and all axial angles are $90^{\circ}$.

$CdS$ crystallizes in which type of crystal system?

The unit cell with crystallographic dimensions,$a \neq b \neq c$,$\alpha = \gamma = 90^{\circ}$ and $\beta \neq 90^{\circ}$ is

Which of the following does $NOT$ have a triclinic structure?