Cov txheej txheem:
- Leej twg nrhiav tau protactinium 231?
- Thaum twg thiab qhov twg tau pom promethium?
- Thaum twg thiab qhov twg nrhiav tau francium?
- Dab tsi yog lub ntsiab lus tsawg tshaj plaws hauv ntiaj teb?
Video: Thaum twg thiab qhov twg tau pom protactinium?
2024 Tus sau: Fiona Howard | [email protected]. Kawg hloov kho: 2024-01-10 06:38
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.
Pom zoo:
Thaum twg thiab qhov twg pom yttrium?
Background. Yttria (Y), lub ntiaj teb uas muaj yttrium tau pom nyob rau hauv 1794los ntawm Gadolin. Nws tau pom nyob rau hauv ib lub chaw txua txiag zeb nyob ntawm Ytterby hauv Sweden. Qhov chaw no tau txais ntau yam khoom txawv txawv uas muaj cov av tsis tshua muaj thiab lwm yam .
Thaum twg qhov tseem ceeb thiab qhov tsis zoo tau ua ke hauv qhov?
Codominance yog thaum ob lub noob tsis qhia kev sib raug zoo ntawm kev sib raug zoo lossis tsis pom qhov nruab nrab, tab sis ob leeg qhia lawv tus kheej ib txhij. Qhov no tau tshaj tawm nyob rau hauv roan cim ntawm nyuj (piv txwv li thaj tsam ntawm 2 txawv xim ntawm daim tawv nqaij) .
Qhov twg thiab thaum twg yog qhov chaw ua haujlwm ntawm thawj kws kho mob kws kho mob tau tsim?
Nyob rau hauv 44 BC, ntawm thawj qhov keeb kwm ntawm kev tshuaj ntsuam xyuas kab mob tshwm sim tam sim ntawd tom qab lub sleighing ntawm Julius Caesar los ntawm nws cov neeg koom tes. Tus kws tshuaj xyuas lub sijhawm ntawd xaus lus tias ntawm 23 qhov txhab pom ntawm lub cev tsuas yog ib tus neeg tuag xwb .
Dab tsi yog qhov txawv ntawm kev pom tsis pom thiab pom tsis pom ntau dua?
Kev muaj peev xwm tawm tsam yam tsis muaj qhov kawg ntawm kev sau ntawv vs kev tuaj yeem cuam tshuam rau lwm tus neeg kuj yog qhov sib txawv. Qhov tseem ceeb Invisibility yog "qhov tseeb nrhiav / nkaum / mus ncig tsis pom" qhov twg Qhov Kev Pom Zoo Tshaj Plaws yog ntau ntawm kev sib ntaus sib tua Puas pom qhov tsis pom kev ua haujlwm ntawm kev pom tsis pom ntau dua?
Lub tswv yim twg yog qhov pom ntawm lub tswv yim ntawm qhov zoo thiab qhov phem?
Kev coj ncaj ncees tuav tias qhov zoo thiab qhov phem yog cov ntsiab lus ruaj khov tsim los ntawm tus vajtswv lossis tus vajtswv, xwm txheej, kev coj ncaj ncees, kev paub zoo, lossis lwm yam. Amoralism hais tias qhov zoo thiab qhov phem tsis muaj qab hau, tias tsis muaj kev coj ncaj ncees hauv qhov xwm txheej .
