Question

What is seven crystal unit cell?

Answer 1

Answer:-

Because mathematically, it's impossible to have more crystal systems in three-dimensional space. "Other" crystal systems can be cut down (simplified) to one of the seven!

There are seven crystal systems, with 14 Bravais-types, 32 crystallographic point-groups and 230 space groups.

In 3D, it's impossible to have more!

Answer 2

hey dear here is your answer
ans- the structure of all crystal can be classified according to the systematic of unit cells. there are in 7 group, collective called crystal system.
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