An exotic atom is an otherwise normal atom in which one or more sub-atomic particles have been replaced by other particles of the same charge. For example...

Euclidean space R4 Exotic sphere, a differentiable n-manifold, homeomorphic but not diffeomorphic to the ordinary n-sphere Exotic atom, an atom with one or more...

Atoms are the basic particles of the chemical elements. An atom consists of a nucleus of protons and generally neutrons, surrounded by an electromagnetically...

dramatic changes in its physical or chemical properties. Degenerate matter Exotic atoms Negative mass would possess some strange properties, such as accelerating...

Muonium (/ˈmjuːoʊniəm/) is an exotic atom made up of an antimuon and an electron, which was discovered in 1960 by Vernon W. Hughes and is given the chemical...

an electron and its anti-particle, a positron, bound together into an exotic atom, specifically an onium. Unlike hydrogen, the system has no protons. The...

consequence of lepton universality. The tau lepton is predicted to form exotic atoms like other charged subatomic particles. One of such, consists of an antitau...

nucleus of atoms. Instead, it binds a random electron and with this electron forms an exotic atom known as muonium (mu) atom. In this atom, the muon acts...

into common use in this context. The rules above do not always apply to exotic atoms which contain short-lived elementary particles other than protons, neutrons...

Positronium hydride, or hydrogen positride is an exotic molecule consisting of a hydrogen atom bound to an exotic atom of positronium (that is a combination of...