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TAKE THE QUIZneptunium 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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Merriam-Webster unabridged
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- Often used to describe “the march of time,” what does inexorable mean?


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