protactinium
发音
How to pronounce protactinium in British English:
英 [ˌprəʊtækˈtɪniəm]
How to pronounce protactinium in American English:
美 [ˌproʊtækˈtɪniəm]
-
- Noun:
- a short-lived radioactive metallic element formed from uranium and disintegrating into actinium and then into lead