Chemistry Solids PMC 2021
PMDC Verified Question 46 of 54
The smallest part of the crystal lattice has all the properties of the entire crystal this is called:
A
Unit
B
Unit cell
C
Unit crystal
D
All of these
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option B: Unit cell
Concept:
A crystal lattice is built from repeating fundamental 3D building blocks.

Solution:
  • The unit cell is defined as the smallest repeating basic 3D structural unit of a crystal lattice.
  • When translated across 3D space, the unit cell generates the entire macroscopic crystal.
  • Because it contains the complete spatial arrangement of atoms/ions, it possesses all the fundamental chemical and geometric properties of the whole crystal.


Why other options are incorrect:
  • A, C, D: "Unit" and "Unit crystal" are not standard crystallographic terms. The precise scientific terminology is "unit cell".

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