the smallest unit of any chemical element, consisting of a positive nucleus surrounded by negative electrons
A molecule consists of a combination of two or more atoms.
An atom is the basic unit of matter, composed of a nucleus containing protons and neutrons, surrounded by electrons in orbit.
The chemical reactions that occur between atoms and molecules are fundamental to understanding the behavior of different substances in chemistry.
Nuclear reactions involve changes in the structure of an atom's nucleus, resulting in the release of energy, which is harnessed in nuclear power plants or atomic bombs.
