## What is meant by Bravais lattice?

Bravais lattice, any of 14 possible three-dimensional configurations of points used to describe the orderly arrangement of atoms in a crystal.

**What is Bravais and non Bravais lattice?**

In a Bravais lattice all lattice points are equivalent and hence by necessity all atoms in the crystal are of the same kind. On the other hand, in a non-Bravais lattice, some of the lattice points are non-equivalent.

**What are Bravais lattices Class 12?**

Bravais Lattice refers to the 14 different 3-dimensional configurations into which atoms can be arranged in crystals. The smallest group of symmetrically aligned atoms which can be repeated in an array to make up the entire crystal is called a unit cell.

### How many units is ZnS?

four formula

ZnS Structure (Sphalerite, r=0.518) Both, zinc and sulfur have tetrahedral coordination. There are four formula units of ZnS per unit cell (S: 8 corners (8/8) + 6 faces (6/2), Zn: 4 tetrahedral holes (4/1)).

**How do you find the number of units per mole?**

Answer

- n = given mass/molar mass.
- =
- Number of atoms = 8.1/27 × 6.022 ×× 10²³
- Number of atoms in one unit cell = 4 (fcc)
- Number of unit cell = [8.1/27 × 6.022 × 10²³]

**How is FCC a Bravais lattice?**

Bravais lattices The body-centered cubic system (cI) has one lattice point in the center of the unit cell in addition to the eight corner points. Each sphere in a cF lattice has coordination number 12. Coordination number is the number of nearest neighbours of a central atom in the structure.

#### What is unique about Bravais lattice?

The Bravais lattice (Space Lattice) is a three-dimensional array of points with the surroundings of each point being identical. The lattice is required to have translational symmetry, and Bravais showed that there were only 14 distinct arrays that exhibited this property, and that these could be 7 groups.

**Why do we study Bravais lattice?**

Bravais lattice is a basic concept in the crystalline solid. This gives information of the periodic array in which the repeated units of the crystal are arranged. The units themselves may be an atom, groups of atoms, molecules, ions, etc.