名詞 promethium:

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
   同義詞：Pm, atomic number 61

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爆炸而成，有十四個擁有從4到54的質(zhì)量數(shù)的同位素，用作β射線源。原子序數(shù)'；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