单词 | promethium |
释义 | promethium【化】 钷Pm promethium pro.me.thi.um AHD: [pr…-m¶“th¶-…m] D.J. [pr*6mi8Gi8*m]K.K. [pr*6miGi*m]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 14 isotopes with mass numbers ranging from 141 to 154 and used as a source of beta rays. Atomic number 61; melting point 1,168&9{=}C; boiling point 2,460&9{=}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141到154的质量数的同位素,用作β射线源。原子序数61;熔点1,168&9{=}C;沸点2,460&9{=}C;原子价为3参见 element语源:From Prometheus 源自 Prometheus |
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