Name the parameters that characterized a unit cell.

Explanation

A unit cell is charaterized by the following six paraments.
(i) The dimensions of the unit cell along three edges. These are repesented by a,b and c. The edges may of may not be mutually perpendicular.
(ii) the angles between the edges. These are represented by ` alpha, beta and gamma.` the angle `alpha`, is between b and c. ` beta` is between a and c and ` gamma` is between a and b.