Hauv qhov xwm txheej, cov hlau feem ntau muaj nyob hauv ib lub xeev ua ke, thiab qee cov hlau xws li kub, nyiaj, platinum, thiab bismuth muaj nyob hauv lub xeev dawb. Feem ntau ntawm cov khoom siv hlau yog oxides thiab sulfides, thiab lwm yam ntaub ntawv yog chlorides, sulfates, carbonates thiab silicates.
Cov khoom muaj nyob rau hauv cov hlau muaj xws li kub, nyiaj, tooj liab, hlau, manganese, zinc, thiab lwm yam. Ntawm atmospheric siab thiab ib txwm kub ntawm 25 degrees Celsius, tag nrho cov hlau tsuas yog mercury (kua) yog cov khoom. Cov hlau ntshiab feem ntau yog nyiaj-dawb (grey), tsuas yog ob peb tsis, xws li kub yog daj-liab, tooj liab yog ntshav-liab. Cov hlau feem ntau yog nrog "qhov chaw" nyob ib sab ntawm lawv.
Cov khoom uas muaj qhov kub thiab txias tiv taus feem ntau txhais tau tias yog hlau. Cov ntsiab lus hlau nyob ntawm sab laug ntawm "boron-astatine ciam teb". Muaj cov ntsiab lus hlau hauv tsib cheeb tsam suav nrog s- cheeb tsam, p- cheeb tsam, d- cheeb tsam, thiab f- cheeb tsam, thiab tag nrho cov kev hloov pauv yog cov hlau.
Hauv cov khoom siv hlau nplaum, muaj ntau cov khoom siv hluav taws xob tsis muaj hluav taws xob. Txawm hais tias cov electrons tsis raug khi rau ib qho atom tshwj xeeb, lawv raug khi rau hauv cov iav siv lead ua ntawm cov hlau; Txawm tias tsis muaj hluav taws xob sab nraud, cov electrons tseem txav mus los vim yog lub zog thermal. Txawm li cas los xij, nyob rau hauv ib tus neeg xyuas pib, qhov nruab nrab net tam sim no yog xoom. Xaiv ib qho kev sib tshuam hauv cov hlau, thiab nyob rau txhua lub sijhawm, tus naj npawb ntawm cov hluav taws xob txav los ntawm ib sab ntawm qhov hla mus rau lwm qhov yog sib npaug rau cov xov tooj ntawm cov hluav taws xob txav mus hla ntu ntu ntawm qhov sib txawv.
Yog tias koj muaj lus nug, thov hu rau peb