The number of crystal systems into which all crystals are classified is
Correct answer: B. seven
- A. four
- B. seven
- C. fourteen
- D. twenty
Explanation
There are seven crystal systems, defined by the relative lengths of the unit cell axes and the angles between them, the cubic system being the most symmetrical. These give rise to fourteen Bravais lattices when the different centring arrangements are counted, which is why fourteen is offered as a distractor. Sodium chloride belongs to the cubic system.
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About Crystal Lattice
A crystal lattice is the regular three-dimensional arrangement of particles in a crystalline solid. The content includes lattice points, unit cells, coordination number, packing patterns, and the differences among ionic, metallic, molecular and covalent network crystals, which should not be confused with amorphous solids.
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