promethium
音标[prə'mi:θiəm]
promethium是什么意思、promethium怎么读
promethium汉语翻译
【化】 钷Pm
promethium词型变化
简写符号:Pm
promethium英语解释
名词 promethium:
- 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同义词：Pm, atomic number 61
promethium详细解释
pro.me.thi.um
n.Symbol Pm （名词）符号 Pm A radioactive rare-earth element prepared by fission of uranium or by neutron bombardment of neodymium, having 4 isotopes with mass numbers ranging from 4 to 54 and used as a source of beta rays. Atomic number '; melting point ,'8=C; boiling point 2,4'0=C; valence 3.See table at element 钜：放射性稀土元素，由铀分裂或钛的中子爆炸而成，有十四个拥有从4到54的质量数的同位素，用作β射线源。原子序数'；熔点,'8=C；沸点2,4'0=C；原子价为3参见 element
来源：From Prometheus 源自 Prometheus
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