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Which of the following is regarded as the ‘repeatable entity’ of a 3D crystal structure?

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in Chemistry – Class 12 by (188k points)
Which of the following is regarded as the ‘repeatable entity’ of a 3D crystal structure?

(a) Unit cell

(b) Lattice

(c) Crystal

(d) Bravais Index

I got this question in an online interview.

The question is from Solid State in portion Solid State of Chemistry – Class 12

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Correct choice is (a) Unit cell

For explanation I would say: Unit cell is the smallest entity of a crystal lattice which, when repeated in space (3 dimensions) generates the entire crystal lattice. Lattice comprises of the unit cells which hold all the particles in a particular arrangement in 3 dimensions. Crystal is a piece of homogenous solid and Bravais indices are used to define planes in crystal lattices in the hexagonal system.

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