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The smallest repetitive unit of the crystal structure is known as____________

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The smallest repetitive unit of the crystal structure is known as____________

(a) Atoms

(b) Compound

(c) Unit cell

(d) Lattice

The question was asked in unit test.

This interesting question is from Definitions topic in chapter X-Ray Diffraction of Solid State Chemistry

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Correct answer is (c) Unit cell

The explanation: Crystal is built up of a regular arrangement of atoms in three dimensions, this arrangement can be represented by a repeat unit or motif called unit cell, thus unit cell is defined as the smallest repeating unit which shows the full symmetry of the crystal structure.

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