Video: Qhov nruab nrab atomic huab hwm coj qhia li cas rau ntawm daim ntawv teev sijhawm txiav txim?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov nruab nrab atomic mass rau ib keeb yog xam los ntawm summing pawg ntawm lub ntsiab isotopes, txhua qhov sib npaug los ntawm nws qhov kev nplua nuj nyob hauv ntiaj teb. Thaum ua ib qho pawg suav nrog cov khoom lossis cov khoom sib txuas, ib txwm siv nruab nrab atomic mass , uas tuaj yeem nrhiav tau ntawm daim ntawv qhia hnub.
Yog li ntawd, cov atomic masses ntawm lub periodic table txiav txim siab li cas?
Ua ke, tus naj npawb ntawm protons thiab tus naj npawb ntawm neutrons txiav txim ib lub ntsiab pawg tus lej. Txij thaum ib lub ntsiab isotopes muaj qhov sib txawv me ntsis pawg num, cov atomic loj yog xam los ntawm kev tau txais lub ntsiab lus ntawm lub pawg tus lej rau nws cov isotopes.
Tsis tas li ntawd, lub ntsiab lus twg yog lub hauv paus rau lub atomic mass system? Dalton xaiv hydrogen los ua tus qauv rau nws lub rooj atomic masses thiab muab hydrogen atom a pawg ntawm 1. Tau kawg, nws tuaj yeem xaiv lwm yam keeb thiab lwm yam nqi rau nws atomic loj . Tab sis hydrogen yog qhov lightest ntawm lub cov ntsiab lus thiab 1 yog tus lej yooj yim tshaj plaws rau kev sib piv.
Ib yam li ntawd, nws yog nug, uas isotope muaj ib qho atomic loj tshaj plaws rau qhov nruab nrab atomic loj teev nyob rau hauv lub sij hawm?
Tag nrho cov pawg ntawm cov khoom raug txiav txim siab txog 12C. Vim muaj ntau yam muaj ib tus lej isotopes , chemists siv nruab nrab atomic mass . Nyob ntawm daim ntawv qhia hnub tus pawg ntawm carbon yog tshaj tawm raws li 12.011 amu.
Puas yog atomic loj ntawm lub rooj zaum?
Tus qauv atomic qhov hnyav yog qhov nruab nrab pawg ntawm ib keeb hauv atomic loj units ("am"). Txawm yog tus kheej atoms ib txwm muaj tus lej tus lej ntawm atomic loj units, cov atomic huab hwm coj nyob rau hauv lub sij hawm yog teev raws li tus lej tus lej vim nws yog qhov nruab nrab ntawm ntau yam isotopes ntawm ib qho keeb.
Pom zoo:
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