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All the particles of the Standard Model have been experimentally observed, including the Higgs boson in 2012. [2] [3] Many other hypothetical elementary particles, such as the graviton, have been proposed, but not observed experimentally.
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 From superseded and obsolete theories
Pages in category "Hypothetical particles" The following 19 pages are in this category, out of 19 total. This list may not reflect recent changes. *
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.
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 chemical elements" The following 74 pages are in this category, out of 74 total. This list may not reflect recent changes. *
Elementary particles from the Standard Model of particle physics that have so far been observed. The Standard Model is the most comprehensive existing model of particle behavior. All Standard Model particles including the Higgs boson have been verified, and all other observed particles are combinations of two or more Standard Model particles.
Chemistry concerns itself with how electron sharing binds atoms into structures such as crystals and molecules. The subatomic particles considered important in the understanding of chemistry are the electron, the proton, and the neutron. Nuclear physics deals with how protons and neutrons arrange themselves in nuclei.