The total number of Bravais lattice arrangements in different crystal systems 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 ............. $pm$.

$Assertion (A)$: White tin is an example of a tetragonal system. $Reasoning (R)$: For a tetragonal system, $a=b=c$ and $\alpha=\beta=\gamma \neq 90^{\circ}$. The correct answer is

Which of the following has a structure similar to a matchbox?

Name the parameters that characterise a unit cell.

How many types of Bravais lattices are there?