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Neutron

electron volts, electronic structure, atomic nuclei, Plutonium, atom of carbon

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Nuclear Energy, energy released during the splitting or fusing of atomic nuclei. The energy of any system, whether physical, chemical, or nuclear, is manifested by the system’s ability to do work or to release heat or radiation. The total energy in a system is always conserved, but it can be transferred to another system or changed in form.

Until about 1800 the principal fuel was wood, its energy derived from solar energy stored in plants during their lifetimes. Since the Industrial Revolution, people have depended on fossil fuels—coal, petroleum, and natural gas—also derived from stored solar energy. When a fossil fuel such as coal is burned, atoms of hydrogen and carbon in the coal combine with oxygen atoms in air. Water and carbon dioxide are produced and heat is released, equivalent to about 1.6 kilowatt-hours per kilogram or about 10 electron volts (eV) per atom of carbon. This amount of energy is typical of chemical reactions resulting from changes in the electronic structure of the atoms. A part of the energy released as heat keeps the adjacent fuel hot enough to keep the reaction going.

History and Current Research

The first large-scale nuclear reactors were built in 1944 at Hanford, Washington, for the production of nuclear weapons material. The fuel was natural uranium metal; the moderator, graphite. Plutonium was produced in these plants by neutron absorption in uranium-238; the power produced was not used.



Article key phrases:

electron volts, electronic structure, atomic nuclei, Plutonium, atom of carbon, oxygen atoms, total energy, Hanford, Industrial Revolution, Nuclear Energy, fossil fuels, kilogram, lifetimes, carbon dioxide, graphite, moderator, natural gas, coal, radiation, petroleum, equivalent, Current Research, plants, ability, wood, heat, fuel, Washington, people, Water, changes, air, History, system, form

 
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