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
Estelle (given name) with only a peripheral profile in Sweden - a 2012 year-end tally would estimate that a total of 663 Swedish residents bore the given name Estelle - touched off a flurry of media debate with writer Herman Lindqvist, who has acted as a historical consultant to the Swedish Royal Family, expressing the extreme negative position thus: "Totally unexpected and inappropriateNo name for a future rulerEstelle sounds like the name of a nightclub queen". Conversely top Scandinavian royalty pundit Kjell Arne Totland () reacted positively, calling Estelle "a very nice name, rich in tradition yet modern". Estelle (given name) Estelle is