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promethium
(redirected from Florentium)

    Also found in: Encyclopedia, Wikipedia, Hutchinson 0.04 sec.
promethium /pro·me·thi·um/ (Pm) (-me´the-um) chemical element, at. no. 61.
pro·me·thi·um (pr-mth-m)
n. Symbol Pm
A radioactive rare-earth element prepared by fission of uranium. Pm 145 is the longest-lived isotope with a half-life of 17.7 years. Atomic number 61.
promethium
a chemical element, atomic number 61, atomic weight 147, symbol Pm. See Table 6.


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