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promethium 音标拼音: [prəm'iθiəm]

n. 烯土类元素

烯土类元素

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.

请选择你想看的字典辞典：

单词	字典	翻译
promethium	查看　promethium　在百度字典中的解释	百度英翻中〔查看〕
promethium	查看　promethium　在Google字典中的解释	Google英翻中〔查看〕
promethium	查看　promethium　在Yahoo字典中的解释	Yahoo英翻中〔查看〕

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