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promethium 音標拼音: [prəm'iθiəm]

n. 烯土類元素

烯土類元素

WordNet (r) 3.0 (2006) (WordNet)

promethium
n 1: a soft silvery metallic element of the rare earth group
having no stable isotope; was discovered in radioactive
form as a fission product of uranium [synonym: {promethium},
{Pm}, {atomic number 61}]

The Elements Database (element)

promethium
Symbol: Pm
Atomic number: 61
Atomic weight: (147)
Soft silvery metallic element, belongs to the lanthanoids. Pm-147, the
only natural isotope, is radioactive and has a half-life of 252 years.
Eighteen radioisotopes have been produced, but all have very short
half-lives. Found only in nuclear decay waste. Pm-147 is of interest as
a
beta-decay source, however Pm-146 and Pm-148 have to be removed from it
first, as they generate gamma radiation. Discovered by J.A. Marinsky,
L.E. Glendenin and C.D. Coryell in 1947.

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promethium	查看　promethium　在Google字典中的解釋	Google英翻中〔查看〕
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