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Which of the following is regarded as the ‘repeatable entity’ of a 3D crystal structure?(a) Unit cell(b) Lattice(c) Crystal(d) Bravais IndexI got this question in an online interview.The question is from Solid State in portion Solid State of Chemistry – Class 12

Answer»

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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