definitions

neptunium series

noun

a radioactive series that starts with plutonium-241 and ends with bismuth-209. Neptunium-237 is the longest-lived member of the series. The series does not occur in nature

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Nearby words

nepotic, nepotism, neptune, neptunian, neptunium, neptunium series, ner tamid, neral, nerc, nerd, nerdic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012