protactinium.
/proh-tak-tin-ee-uhm/US // ˌproʊ tækˈtɪn i əm //UK // (ˌprəʊtækˈtɪnɪəm) //
镤化物,镤星,镤元素,镤亮
Definitions
n.noun · 名词
- 1.
Chemistry.
- ›a radioactive, metallic element. Symbol: Pa; atomic number: 91.
Level 5More words in p →
镤化物,镤星,镤元素,镤亮
Chemistry.