GEOLOGY

Detailed explanation-1: -Lattice points are the positions (or coordinates if you wish) where you can place an atom. Therefore you can find either atoms or vacancies in the lattice points of a crystal structure.

Detailed explanation-2: -The three-dimensional network of imaginary lines connecting atoms is called the space lattice. A crystal is an arrangement in three dimensions of atoms or molecules in repetitive patterns. The smallest unit having the full symmetry of the crystal is called the unit cell, the edges of which form three axes: a, b, and c.

Detailed explanation-3: -(b) There are 4 lattice points/unit cell in the face-centered orthorhombic crystal structure. Therefore there must be 2 atoms per lattice point.

Detailed explanation-4: -In mineralogy, atomic lattice refers to the arrangement of atoms into a crystal structure. In order theory, a lattice is called an atomic lattice if the underlying partial order is atomic. In chemistry, atomic lattice refers to the arrangement of atoms in an atomic crystalline solid.