MEHAU KULYK / SCIENCE PHOTO LIBRARY MEHAU KULYK / SCIENCE PHOTO LIBRARY
Electron orbits. Computer graphic illustration of four electrons in orbit around an atomic nucleus. This image is highly schematic, as it is now thought that electrons inhabit a fuzzy 'probability cloud' around the nucleus. The concept illustrated here pre- dates quantum theory, and shows the electrons in well- defined circular orbits (often called the Bohr Model).
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