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A perfect crystal is one in which...

A perfect crystal is one in which

A

the free energy is minimum

B

entropy is zero at room temperature

C

each atom is vibrating on its correct lattice position in the crystal structure

D

each atom is in rest at its correct lattice position in the crystal structure

Text Solution

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The correct Answer is:
4
At zero Kelvin, most of the ionic crystals possess no defect as a perfect ordered arrangement of constituent particles in a crystal is possible only at `0 K` . In a crystalline solid, there is a regular arrangment of constitutent particles. However this arrangement is usually not found to be perfect, because a solid contains a large number of small crystals and some of these may not have a perfect regular arrangement of the constituent particles.
Imperfection or defeat describes any departure from perfectly ordered arragnement of constituent particles in crystal.
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