Protaktinii
Protaktinii (lat.
| 91 | Protaktinii |
231,036 | |
| 5f26d17s2 | |
Alguainehen atomnoumer on 91, kirjutusmerki on Pa. Protaktinii on radioaktiivine metallu, kudai kuuluu aktinoidoin joukkoh. Enzimäzinny Protaktinien löydämizes ilmoitettih Otto Gan (Otto Hahn) da Liza Meitner (Lise Meitner). Se oli vuonnu 1918. Heis rippumattah protaktinien izotoupan suadih Frederik Soddi (Frederick Soddy) da Džon Krenston (John Arnold Cranston).
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