Question

Define centre of symmetry of a crystal.

Answer 1

It is an imaginary point in the crystal that any line drawn through it intersects the surface of the crystal at equal distance on either side. A cubic crystal possesses total 23 elements of symmetry.

Answer 2

centre of symmetry a point within an object or figure through which any straight line also passes through two points on the edge of the figure at the same distance from the center but on opposite side