Leej twg tau cais cov hlau thiab nonmetals?
Leej twg tau cais cov hlau thiab nonmetals?

Video: Leej twg tau cais cov hlau thiab nonmetals?

Video: Leej twg tau cais cov hlau thiab nonmetals?
Video: Dab neeg Vauv tsis haum niam tais 2/6/2017 2024, Kaum ib hlis
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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.

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