RICHARD KAIL / SCIENCE PHOTO LIBRARY RICHARD KAIL / SCIENCE PHOTO LIBRARY
Oxygen atom, conceptual image. Computer illustration showing the orbits (rings) of electrons (bright spots) around the nucleus (round, centre) of a single oxygen atom. Each oxygen atom contains 8 electrons in two orbits around the 8 protons and 8 neutrons (spheres, centre) that make up its nucleus.
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