单词promethium
n.: 钷（放射性化学元素）
网络: 鉕；钜；烯土类元素
钷（放射性化学元素）:
a chemical element. Promethium is a radioactive metal that was first produced artificially in a nuclear reactor and is found in small amounts in nature.
【化学】钷
钷Pm
Study of Preparation Process for Crystalline Promethium- neodymium Carbonate
晶型碳酸镨钕沉淀制备工艺的研究
Technetium (atomic 43), promethium (atomic 61), Polonium (atomic 84)and all elements with an atomic number greater than 84;
锝（原子序数43）、钷（原子序数61）、钋（原子序数84）及原子序数大于84的所有化学元素；