Video: Leej twg tau cais cov hlau thiab nonmetals?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
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Raws li txoj cai, leej twg cais cov hlau los ntawm nonmetals?
Xyoo 1923, Horace G. Deming, kws tshuaj Asmeskas, tau luam tawm luv luv (Mendeleev style) thiab nruab nrab (18-kem) daim ntawv teev sijhawm. Txhua tus muaj ib txoj kab uas tsis tu ncua cais cov hlau los ntawm nonmetals.
leej twg nrhiav tau nonmetals? SELENIUM. Thaum Swedish chemist Jons Berzelius (1779-1848) thawj zaug pom selenium nyob rau hauv 1817, nyob rau hauv deposits nyob rau hauv qab ntawm lub tank nyob rau hauv ib tug sulfuric acid Hoobkas, nws xav tias nws yog tellurium, ib tug metalloid nrhiav tau nyob rau hauv 1800. Ob peb lub hlis tom qab, nws rov xav txog cov pov thawj, thiab paub nws. tau pom lub ntsiab tshiab.
Ib yam li ntawd, tib neeg nug, tus neeg xyuas pib yog hlau lossis nonmetal?
Kev coj ua: Qee cov metalloids, xws li silicon thiab germanium, tuaj yeem ua hluav taws xob tus thawj coj raws li txoj cai, yog li lawv hu ua semi- tus thawj coj . Luster: Silicon piv txwv zoo li lustrous, tab sis tsis yog malleable los yog ductile (nws yog brittle - ib tug yam ntxwv ntawm ib co nonmetals ).
Cov pab pawg twg yog cov hlau?
Lub rooj ntu ntu ntawm sab laug cais cov ntsiab lus ua peb pab pawg : cov hlau (ntsuab nyob rau hauv lub rooj), nonmetals (txiv kab ntxwv), thiab metalloids (xiav). Cov ntsiab lus feem ntau yog hlau . Lawv feem ntau ci ntsa iab, ntom heev, thiab tsuas yog yaj ntawm qhov kub thiab txias. Lawv cov duab tuaj yeem hloov tau yooj yim rau hauv cov xov hlau nyias lossis cov ntawv tsis muaj kev tawg.
Pom zoo:
LEEJ TWG ceeb toom FDR cov neeg German tau tsim riam phom atomic thiab US xav tau ua ib yam?
Xya caum tsib xyoos dhau los, Hungarian-American physicist Leo Szilard tau sau ib tsab ntawv mus rau Tebchaws Meskas Thawj Tswj Hwm Franklin Roosevelt qhia kev txhawj xeeb tias cov kws tshawb fawb German yuav sai sai no qhib qhov zais cia los tsim thawj lub foob pob tawg
Cov yam ntxwv twg ntawm cov hlau atoms pab piav qhia vim li cas valence electrons hauv cov hlau yog delocalized?
Ib daim ntawv cog lus hlau yog kev sib koom ntawm ntau cov khoom siv hluav taws xob sib cais ntawm ntau cov ions zoo, qhov twg cov electrons ua raws li 'cov kua nplaum' muab cov khoom tsim nyog. Nws tsis zoo li covalent lossis ionic bonding. Cov hlau muaj zog ionization tsawg. Yog li ntawd, valence electrons tuaj yeem raug delocalized thoob plaws hauv cov hlau
Dab tsi yog qhov zoo sib xws ntawm cov hlau nonmetals thiab metalloids?
Nyob rau hauv sib piv, metalloids yog nkig dua piv nrog cov hlau uas yog ductile thiab malleable (yog tias khoom). Hauv kev sib piv nrog cov hlau tsis yog hlau, metalloids tuaj yeem yog cov insulators thiab nkig (yog tias cov hlau tsis yog hlau). Hauv qhov sib piv, cov hlau tsis yog hlau tsis zoo li cov hlau nplaum thiab feem ntau ntawm cov hlau tsis yog gasses
Dab tsi yog qhov zoo sib xws ntawm cov hlau thiab nonmetals?
Qhov zoo sib xws ntawm cov hlau thiab cov hlau tsis yog: Cov hlau thiab cov hlau tsis yog cov khoom. Ob leeg muaj tib lub qauv atomic. Ob leeg sib koom electrons los ua molecules
Leej twg yog leej niam leej txiv pab txhawb cytoplasmic qub txeeg qub teg?
Nyob rau hauv cov ntaub ntawv ntawm cytoplasmic qub txeeg qub tes, cov teebmeem ntawm niam txiv. Qhov no feem ntau yog vim muaj kev koom tes ntau dua ntawm cytoplasm rau zygote los ntawm niam txiv poj niam dua li txiv neej niam txiv. Feem ntau ovum txhawb ntau cytoplasm rau zygote dua cov phev