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actinide series

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actinide series

a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

actinide series

[′ak·tə‚nīd ′sir‚ēz]
(chemistry)
The group of elements of atomic number 89 through 103. Also known as actinoid elements.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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