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promethium

noun
/prəˈmiːθiəm/
/prəˈmiːθiəm/
[uncountable]
(symbol Pm)
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  1. a chemical element. Promethium is a radioactive metal that was first produced artificially in a nuclear reactor and is found in small amounts in nature.钷(放射性化学元素)
    Word Origin1940s: modern Latin, from the name of the Titan Prometheus, a demigod in Greek mythology who was worshipped by craftsmen.
promethium
Chemical elements:actinium, alkali metal, americium...

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