neptunium series

noun

: a radioactive series that does not now occur in nature and that begins with plutonium of mass number 241 and continues to americium, to the longest-lived member of the series neptunium of mass number 237, and eventually to the stable end product bismuth

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“Neptunium series.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/neptunium%20series. Accessed 26 Nov. 2024.

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