protactinium
音標[,pr?ut?k'tini?m] 讀音漢語翻譯
n. 鏷
【化】 鏷Pa
【醫】 鏷(91號元素)
詞型變化：
簡寫符號:Pa英文解釋：
名詞 protactinium:
- a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead同義詞：protoactinium, Pa, atomic number 91
詳細解釋：
pro.tac.tin.i.um
n.Symbol Pa （名詞）符號 Pa A rare, extremely toxic, radioactive element chemically similar to uranium, having 3 known isotopes, the most common of which is protactinium 23 with a half-life of 32,480 years. Atomic number 9; melting point ,230=C; specific gravity 5.37; valence 4, 5.See table at element 鏷：一種稀有的、劇毒放射性元素，在化學性質上與鈾相似。有十三個已知的同位素，其中最常見的是半衰期為32,480年的鏷23。原子序數為9；熔點,230=C；比重5.37；原子價4, 5參見 element
來源：prot(o)- prot(o)-actinium [so called because it disintegrates into actinium] actinium [它被這樣取名是由於它分裂成錒]
展開閱讀更多↓