👉 An atom is a fundamental unit of matter, typically made up of atoms or subatomic particles. In physics, atoms are the smallest indivisible units of matter that cannot be broken down into smaller parts. They consist of protons and neutrons, which are electrically charged particles, and electrons, which orbit around the nucleus, making up the mass of the atom. Atoms have a fixed number of protons, which determine their chemical properties. The number of electrons determines the atomic structure, with atoms
