MIKE AGLIOLO / SCIENCE PHOTO LIBRARY MIKE AGLIOLO / SCIENCE PHOTO LIBRARY
Atom. Computer illustration showing electrons orbiting an atomic nucleus. This is the traditional way the structure of an atom is depicted, showing electrons orbiting in paths around a central nucleus. The number of electrically positive protons in the nucleus balances the number of negatively charged electrons. This image is highly schematic. Scientists now believe that electron orbits are more eccentric and electrons inhabit a "cloud of probability" rather than moving in well-defined orbital paths (often called the Bohr model).
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