promethium
音標[prə'mi:θiəm] 讀音漢語翻譯
【化】 鉕Pm
詞型變化:
簡寫符號:Pm英文解釋:
名詞 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同義詞:Pm, atomic number 61
詳細解釋:
pro.me.thi.um
n.Symbol Pm (名詞)符號 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 鉅:放射性稀土元素,由鈾分裂或鈦的中子 * 而成,有十四個擁有從4到54的質量數的同位素,用作β射線源。原子序數';熔點,'8=C;沸點2,4'0=C;原子價為3參見 element
來源:From Prometheus 源自 Prometheus
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