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Chapter 4: Problem 4

The number of crystal systems is (a) 5 (b) 7 (c) 14 (d) 21

Short Answer

Expert verified
The correct number of crystal systems is 7. So the answer is (b) 7.

Step by step solution

01

Understanding the question

The question asks for the number of known crystal systems. Crystal systems are the categories of symmetry groups. Each crystal system includes a set of lattice parameters.
02

Recall the knowledge about crystallography

In the field of crystallography, a crystal is defined by its symmetry content. There are seven unique crystal systems.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Understanding Crystallography
Crystallography is a branch of science that studies the structure, properties, and formation of crystals. It's concerned with the atomic arrangement in crystalline solids and is a fundamental aspect in materials science, geology, biology, and even in the production of pharmaceuticals.
Grasping Lattice Parameters
Lattice parameters are the brick and mortar of crystallography. They are crucial numerical values that define the dimensions and the overall geometry of the unit cell in a crystal structure.
Deciphering Symmetry Groups
Symmetry is a pervasive phenomenon in nature, and in crystallography, it is systematically classified through symmetry groups. These are sets of symmetry operations that include rotations, reflections, inversions, and translations, which are applied to a point in space to produce an identical point.

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Most popular questions from this chapter

The number of atoms per unit cell of BCC structure is (a) 1 (b) 2 (c) 3 (d) 4

The number of atoms per unit cell of face-centred cubic structure is (a) one (b) two (c) three (d) four

The number of Bravais lattices is (a) 256 (b) 7 (c) 14 (d) 37

If the periodicity of atoms or molecules is extended in large number of small regions of different sizes in the solid, then it is known as (a) single crystalline solid (b) polycrystalline solid (c) amorphous solid (d) none

The arrangement of atoms in a crystal is called (a) lattice (b) crystal structure (c) crystal symmetry (d) none
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