The electron shells depicted in the diagrams in this feature represent electrons' energy levels and not how electrons move around an atom's nucleus. The diagrams also do not depict the distance between an electron and the particles in the nucleus, which are relatively great. Physicists have found that electrons do not move along a definite path, and the location of electrons as they move cannot really be measured. Electrons are found within an "electron cloud" which surrounds the nucleus. Finally, no one has ever seen a quark by itself. Quarks are always found as part of a triplet, or as a quark-antiquark pair.
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