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actinide
Any member of the series of elements with atomic numbers from 89 (actinium) to 103. The actinides are, in order of increasing atomic number: actinium, thorium, protactinium, uranium, neptunium, plutonium, americium, curium, berkelium, californium, einsteinium, fermium, mendelevium, nobelium, and lawrencium. Each actinide is analogous to the corresponding member of the lanthanide series. Elements having atomic numbers greater than 92 are called transuranic elements.
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• INORGANIC CHEMISTRY
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