Promethium Alloy钷合金
Promethium sesquioxide三氧化二钷
Promethium Isotope钷同位素
promethium ions镨离子
Keywords promethium水域生态系
promethium cell钷蓄电池;[电] 钷电池
Promethium Compound钷化合物
Promethium oxide三氧化二钷
Pm Promethium钷
N(名词) a radioactive element of the lanthanide series artificially produced by the fission of uranium. Symbol: Pm; atomic no: 61; half-life of most stable isotope, 145Pm: 17.7 years; valency: 3; melting pt: 1042°C; boiling pt: 2460°C (approx.) 钷