Point particle of point charges cannot be maintained in an equilibrium configuration solely by the electrostatic interaction of the charges. In quantum mechanics, there is a distinction between an elementary particle (also called "point particle") and a composite particle. An elementary particle, such as an electron, quark, or photon, is a particle with no internal structure. Whereas a composite particle, such as a proton or neutron, has an internal structure (see figure). However, neither elementary nor composite particles are spatially localized, because of the Heisenberg uncertainty principle. The particle wavepacket always occupies a nonzero volume. For example, see atomic orbital: The electron
Duane (given name) Duane (given name) Duane is both a given name for a male, and a family name. It seems to have a convergent etymology from several sources. The name derives from St. Dubhán, a Welsh Saint who established an abbey in Hook Head, Ireland, during the 5th century. As a surname it is O'Dubhain, or Dubhan. Dubhain was a popular given name in 16th century southern Ireland; its anglicized form is Duane. Many people may claim that one of the name's origins is the Norman "D'Wain" ("of Wagons") or the Old English version meaning "field" or "meadow". However, Duane is an