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promethium

Pronunciation: pro-me'the-um

Definition: A radioactive element of the rare earth series, atomic no. 61; first chemically identified in 1945; 145Pm has the longest known half-life (17.7 years).

[Prometheus, a Titan of G. myth who stole fire to give to mortals]

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© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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