Question

Crystals in which the number of the combinations of the symmetric molecule is limited to 32 is known as _________

(a) Crystallographic unit cell

(b) Crystallographic point groups

(c) Crystallographic crystals

(d) Crystallographic atoms

I got this question in exam.

My question is taken from Definitions in division X-Ray Diffraction of Solid State Chemistry

Answer 1

Right answer is (b) Crystallographic point groups

To explain: Many molecules and crystals possess more than one element of point symmetry, but the number of combinations of the symmetric molecule is limited to 32, these are known as crystallographic point groups.