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Question

Crystals can be classified into....... basic crystal systems.

A
7
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B
4
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C
14
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D
3
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Solution

The correct option is A 7
For 3D-space lattice, there are seven unique and basic unit-cell shapes (primitive unit cells) with varying elements of symmetry in a three-dimensional space.
Almost all the crystals found in nature, conform to one of the seven crystal systems.
The seven crystal systems are
Crystal sysytem Edge lengths Angles
Cubic a=b=c α=β=γ=90o
Tetragonal a=bc α=β=γ=90o
Orthorombic abc α=β=γ=90o
Hexagonal a=bc α=β=90o;γ=120o
Rhombohedral a=b=c α=β=γ90o
Monoclinic abc α=γ=90o;β90o
Triclinic abc αβγ90o

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