Definition of actinide
: any of the series of elements with increasing atomic numbers that begins with actinium or thorium and ends with lawrencium — see Periodic Table
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Uranium is currently the actinide of choice for the industry, used (sometimes with a little plutonium) in 100 percent of the world’s commercial reactors.
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Origin and Etymology of actinide
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Britannica.com: Encyclopedia article about actinide
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