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Neutronium, hypothetical nuclei consisting only of neutrons (more than one). Examples include the tetraneutron. Preons were suggested as subparticles of quarks and leptons, but modern collider experiments have all but ruled out their existence. Rishons, particles from the Rishon model of preons. From superseded and obsolete theories
Elementary particles are particles with no measurable internal structure; that is, it is unknown whether they are composed of other particles. [1] They are the fundamental objects of quantum field theory. Many families and sub-families of elementary particles exist. Elementary particles are classified according to their spin.
Pages in category "Hypothetical particles" The following 19 pages are in this category, out of 19 total. This list may not reflect recent changes. *
Hypothetical particles and states of matter that have not yet been encountered, but whose properties would be within the realm of mainstream physics if found to exist. Several particles whose existence has been experimentally confirmed that are conjectured to be exotic hadrons and within the Standard Model .
Pages in category "Hypothetical elementary particles" The following 44 pages are in this category, out of 44 total. This list may not reflect recent changes.
Pages in category "Hypothetical chemical elements" The following 74 pages are in this category, out of 74 total. This list may not reflect recent changes. *
Hypothetical compounds are used in some thought experiments. Some compounds long regarded as hypothetical have later been isolated. Ethylene dione was suggested in 1913 and observed spectroscopically in 2015. [1] Another stable compound, potassium trichromate, has been produced in a small scale and is known to be a very powerful oxidizing agent ...
Semicrystalline: A solid state in complex organic chemistry where molecules are packed in a regular order but have substantial local disorder. Different structural phases of polymorphic materials are considered to be different states of matter in the Landau theory. For an example, see Ice § Phases. Liquid: A mostly non-compressible fluid. Able ...