actinide series

actinide series

noun Chemistry.
the series of radioactive elements that starts with actinium and ends with lawrencium.

Origin:
1940–45
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Actinide series is always a great word to know.
So is labile. Does it mean:
a colorless, flammable gas, C4H10, a saturated aliphatic existing in two isometric forms: used chiefly in the manufacture of rubber and as fuel
a compound capable of changing state or becoming inactive when subjected to heat or radiation
Collins
World English Dictionary
actinide series
 
n
a series of 15 radioactive elements with increasing atomic numbers from actinium to lawrencium

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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