What is an atom in a chemical composition?

The atom is the smallest constituent of matter. It consists of an atomic nucleus, which is charged with a positive charge in the atom. The nucleus of an atom has a high density and, in turn, consists of even smaller stable, elementary particles, a proton and a neutron. The proton is positively charged, and the neutron is not charged in any way, it is neutral. The mass of the nucleus of an atom is the sum of the total mass of protons and neutrons.
Electrons revolve around the atomic nucleus in orbit. The orbital radius of electrons is different for different chemical elements. Electrons carry an elementary negative charge.

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