How many kinds of Bravais lattices are possible in crystal systems?

Assertion : Graphite is an example of a tetragonal crystal system.
Reason : For a tetragonal system,$a = b \neq c$,$\alpha = \beta = 90^o$,$\gamma = 120^o$.

If the edge length of a cubic unit cell of $Li$ having $bcc$ structure is $351 \, pm$, then the radius of the $Li$ atom will be ............ $pm$.

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

Crystals can be classified into how many basic crystal systems?

For a simple cubic crystal,the edge length is expressed as: