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
Aodh (given name) Aodh (given name) Aodh (; ) is an Irish and Scottish Gaelic male given name, originally meaning "fire". Feminine forms of the name include Aodhnait and Aodhamair. It appears in even more variants as a surname. As a surname, the root or a variant may be prefixed by "O", "Ó", or "Ui" (meaning "from" or "descendant of"), "Mac" or "Mc" (meaning "son of"), or "Nic" (meaning "daughter of"). The name was originally related to an Irish god of the underworld. The masculine given name Hugh is a common anglicization, although the names are not etymologically linked (see Hughes (surname), Hughes