Question

The physical dimension of unit cells in a crystal lattice:
A.Lattice parameter.
B.Packing Factor.
C.Atomic Radius.
D.Number of Constituent particles.

Answer 1

We know that a Crystal lattice is defined as a three-dimensional arrangement of atoms, ions, or any constituent particle in space. These atoms, ions, or particles that comprise the lattice are called lattice points. These points are joined together by a straight line.

Complete answer:
Every crystal lattice is formed from a unit cell. A unit cell is the basic entity of a lattice. A unit cell is the smallest repeating unit of the cell which when repeated over and over gives the crystal lattice. A lattice constant or parameter is used to define the physical dimension of unit cells in a crystal lattice. Generally, there are six lattice parameters of a unit cell, three are edges and three are the angles between them.
Lattice parameter which refers to the physical dimension of unit cells in a crystal lattice. Lattices in three dimensions generally have three lattice constants, referred to as a, b, and c.

Therefore, the correct answer is option A.

Note:
Remember that Unit cells are divided into two categories: Primitive unit cell Centred Unit cell. In the primitive unit cell, the constituent atom or particle occupy the positions of the corners. Centred Unit cells are divided into three types: Body Centred Unit cell; Face centred Unit cell and Edge Centred Unit cell.