Video: Vim li cas cov hlau alkali tsis tshua muaj melting point?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Alkali hlau muaj qis melting thiab Cov ntsiab lus kub
Cov hluav taws xob no tuaj yeem txav deb ntawm cov nucleus ntau dua li ntawm cov atoms ntawm lwm cov ntsiab lus. Qhov nce atomic radius txhais tau tias tsis muaj zog ntawm cov atoms thiab yog li a qis melting thiab kub point.
Ib yam li ntawd, nws raug nug, vim li cas cov hlau alkali muaj qis melting thiab boiling point?
Tag nrho alkali hlau yog mos heev thiab lawv muaj tag nrho qis melting / cov ntsiab lus kub . Alkali hlau muaj tsuas yog ib qho valence electron thiab lwm yam muaj qis khi lub zog rau cov xim hlau siv lead ua lattice. A qis tus nqi zog xav tau los rhuav ib daim ntawv cog lus txhais tau tias a qis melting / kub point.
Ib yam li ntawd, qhov twg alkali hlau muaj qhov qis tshaj melting point? Cesium
Yog li ntawd, cov hlau alkali puas muaj cov ntsiab lus siab lossis qis qis?
Cov alkali hlau muaj cov ntsiab lus melting tsawg , xws li a siab ntawm 179 ° C (354 ° F) rau lithium rau a qis ntawm 28.5 ° C (83.3 ° F) rau cesium. Alloys ntawm alkali hlau muaj li ntawd yaj raws li qis Raws li -78 ° C (-109 ° F).
Vim li cas magnesium thiaj li melting point tsawg?
Cov melting cov ntsiab lus tau qis dua raws li koj mus rau hauv pab pawg vim cov hlau bonds tau tsis muaj zog. Qhov oddity ntawm magnesium muaj kom piav qhia nyias. Lub atoms nyob rau hauv ib tug hlau yog tuav ua ke los ntawm attraction ntawm lub nuclei mus rau lub delocalised electrons.
Pom zoo:
Vim li cas cov ntsiab lus hnyav tsis tshua muaj nyob hauv lub qab ntuj khwb?
Cov ntsiab lus los ntawm cov pa roj carbon mus rau hlau muaj ntau dua nyob rau hauv lub ntiaj teb vim qhov yooj yim ntawm kev ua rau lawv nyob rau hauv supernova nucleosynthesis. Cov ntsiab lus ntawm cov atomic ntau dua li cov hlau (cov ntsiab lus 26) dhau los ua tsis tshua muaj nyob hauv lub ntiaj teb, vim tias lawv tau nqus cov hnub qub zog hauv lawv cov khoom tsim
Qhov laj thawj twg zoo tshaj plaws piav qhia vim li cas cov hlau tsis muaj ductile es tsis nkig?
Cov hlau yog ductile es tsis txhob nkig vim tias lawv muaj cov ntawv cog lus hloov tau. Ductility txhais tau hais tias muaj peev xwm ntawm cov hlau los kos rau hauv cov xov hlau. Cov hlau muaj cov khoom sib txuas yooj yim. Qhov kev hloov pauv no tso cai rau lawv ua cov khoom siv
Puas yog alkali hlau tsis tshua muaj?
Lwm cov alkali hlau yog qhov tsawg dua, nrog rubidium, lithium, thiab cesium, feem, tsim 0.03, 0.007, thiab 0.0007 feem pua ntawm lub ntiaj teb crust. Francium, ib tug natural radioactive isotope, yog tsawg heev thiab tsis tau nrhiav tau kom txog rau thaum 1939. periodic tableModern version ntawm lub periodic rooj ntawm lub ntsiab
Cov hlau tsis tshua muaj hauv ntiaj teb yog dab tsi hauv xov tooj ntawm tes?
Cov xov tooj smartphones kuj tseem muaj ntau yam ntawm lub ntiaj teb tsis tshua muaj - cov ntsiab lus uas muaj ntau nyob hauv lub ntiaj teb pob zeb tab sis nyuaj heev rau kuv thiab rho tawm kev lag luam - suav nrog yttrium, lanthanum, terbium, neodymium, gadolinium thiab praseodymium
Dab tsi yog hlau tsis muaj melting siab thiab boiling point?
Pob zeb diamond yog ib qho allotrope / daim ntawv ntawm carbon. Yog li, carbon (nyob rau hauv daim ntawv ntawm pob zeb diamond) yog tib yam uas tsis yog-hlau uas muaj heev melting point