(n.) Amber; also, the alloy of gold and silver, called electrum.

Kern NMR alpha particle antibaryon antilepton antimeson atom atomic nucleus atomic particle baryon beta particle cathode particle electron affinity electron cloud electron pair electron shells electron spin electron transfer electron-positron pair elementary particle energy level excited state extranuclear electrons ground state ion lepton lone pair meson molecule monad negatron neutron nuclear force nuclear magnetic resonance nuclear particle nuclear resonance nucleon nucleosynthesis nucleus octet orbital electron photoelectron photon proton quark recoil electron secondary electron shared pair strangeness strong interaction subvalent electrons surface-bound electron thermion triton valence electron valence electrons valence shell wandering electron