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A proton is a stable subatomic particle with a positive electric charge of +1 e. It is composed of two up quarks and one down quark, and has a mass of about 938 MeV/c2. Learn more about its structure, radius, magnetic moment, and role in chemistry and physics.
An atom is the smallest particle of an element that has the same chemical properties as the element. It consists of a nucleus of protons and neutrons, surrounded by electrons. Learn about the history of atomic theory, the structure and properties of atoms, and how they form compounds.
The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford. Learn about the history, etymology, principles, and models of the nucleus, as well as its role in nuclear physics and chemistry.
A neutron is a subatomic particle with a neutral charge and a mass slightly greater than that of a proton. It is composed of three quarks and forms part of the nucleus of atoms with other protons. Learn about its role in nuclear physics, chemistry, and nuclear power.
An electron is a subatomic particle with a negative charge and a spin of 1/2. It belongs to the lepton family and has various roles in physics, chemistry, and technology. Learn about its discovery, interactions, and applications.
Isotope half-lives. The darker more stable isotope region departs from the line of protons (Z) = neutrons (N), as the element number Z becomes larger. Isotopes are nuclides with the same number of protons but differing numbers of neutrons; that is, they have the same atomic number and are therefore the same chemical element. Isotopes neighbor ...