An atom is the basic unit of a chemical element, and the two main regions of this structure are the nucleus and electrons. The nucleus is positively charged, while the electrons are negatively charged and orbit the nucleus.
Almost all of the atom is made up of the nucleus, which is comprised of uncharged neutrons and protons, which are the nucleus's positively charged components. Electrons constantly orbit the nucleus, and when the number of electrons equals the element's atomic number, the atom is considered to be neutral. The atom's chemical and electrical properties are ultimately decided by the outermost electrons.