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
Given name Chinese, Singapore, and Vietnam, among others), as well as in Southern and North-Eastern parts of India, and in Hungary. This order is common also in Austria and Bavaria, and in France, Belgium, Greece and Italy, possibly because of the influence of bureaucracy, which commonly puts the family name before the given name. In China and Korea, part of the given name may be shared among all members of a given generation within a family and extended family or families, in order to differentiate those generations from other generations. The order "given name – father's family name – mother's family name"