Protactinium: keeb kwm Protactinium tau tshawb pom los ntawm Otto Hahn, Lise Meitner, Frederick Soddy, John Cranston hauv 1913 ntawm Lub Tebchaws Yelemees, England.
Leej twg nrhiav tau protactinium 231?
Protactinium lub neej tau lees paub hauv xyoo 1918 thaum lwm qhov isotope, protactinium-231, tau tshawb pom ntawm nws tus kheej thiab kawm los ntawm ob pawg kws tshawb fawb, Otto Hahn thiab Lise Meitner ntawm lub teb chaws Yelemees thiab Frederick Soddy thiab John Cranston ntawm Great Britain.
Thaum twg thiab qhov twg tau pom promethium?
Glendenin thiab Charles D. Coryell hauv xyoo 1944. Tsis khoom nrog kev tshawb fawb txog kev tiv thaiv hauv Ntiaj Teb Tsov Rog II, lawv tsis lees paub lawv qhov kev tshawb pom kom txog thaum 1946 Lawv nrhiav pom promethium thaum soj ntsuam cov khoom lag luam. ntawm uranium fission uas tau tsim nyob rau hauv lub nuclear reactor nyob rau ntawm Clinton Laboratories hauv Oak Ridge, Tennessee.
Thaum twg thiab qhov twg nrhiav tau francium?
Francium thaum kawg tau pom hauv 1939 los ntawm Marguerite Perey ntawm Curie Institute hauv Paris. Nws tau ntxuav cov qauv ntawm actinium dawb ntawm tag nrho nws cov xov tooj cua tsis huv uas paub txog thiab tseem nws cov xov tooj cua tseem qhia tau tias muaj lwm lub ntsiab lus tam sim no, thiab qhov uas nws raug txiav tawm yog qhov ploj lawm 87.
Dab tsi yog lub ntsiab lus tsawg tshaj plaws hauv ntiaj teb?
Ib pab pawg ntawm cov kws tshawb fawb siv ISOLDE nuclear-physics chaw ntawm CERN tau ntsuas thawj zaug lub npe hu ua electron affinity ntawm cov tshuaj lom neeg astatin, qhov tsis tshua muaj tshwm sim. Element on Earth.
