A molecular substance is the smallest part into which substances can be divided without losing their properties. It is formed when two or more atoms create a chemical bond. Depending on the number of different atoms forming a molecule, it can be categorized as an element or a compound.
Molecules are invisible to the eye. They are the smallest particles that retain the physical and chemical properties of a substance. The particle itself consists of atoms, even smaller units whose structure and interaction enable the forming of bonds. The covalent bonds keep the molecular structure from falling apart. Molecules are considered to be in constant motion, although the type of movement depends on the substance.
Different types of molecules do not weight the same. Their size also varies depending on the atoms that comprise them. When a molecule consists of two or more atoms of the same kind, it is called an element. A compound, on the other hand, is a molecule formed by two or more different atoms. Elements are further divided into two categories. Diatomic molecules consist of only two atoms, while polyatomic are comprised of at least three components. There can be over a thousand atoms in a single molecule.