Dab tsi yog tus lej 34 ntawm lub sijhawm teem sijhawm?
Dab tsi yog tus lej 34 ntawm lub sijhawm teem sijhawm?

Video: Dab tsi yog tus lej 34 ntawm lub sijhawm teem sijhawm?

Video: Dab tsi yog tus lej 34 ntawm lub sijhawm teem sijhawm?
Video: Saib Mis paub Poj niam (hluas nkauj) tus yam ntxwv lub siab 2024, Kaum ib hlis
Anonim

Selenium yog tshuaj lom neeg keeb nrog lub cim Se thiab atomic num 34 . Nws yog nonmetal (ntau dua tsis tshua pom tias yog metalloid) nrog cov khoom uas yog nruab nrab ntawm cov ntsiab lus saum toj thiab hauv qab hauv daim ntawv qhia hnub , sulfur thiab tellurium, thiab kuj muaj qhov zoo sib xws rau arsenic.

Hais txog qhov no, tus lej 35 yog dab tsi ntawm lub sijhawm teem sijhawm?

Bromine yog ib qho tshuaj keeb nrog cim Br thiab atomic nrv 35 . Nws yog qhov thib peb-lightest halogen, thiab yog fuming liab-xim av kua nyob rau hauv chav tsev kub uas evaporates nkag mus rau ib tug zoo xws li cov xim roj. Qhov loj ntawm bromine nyob rau hauv dej hiav txwv yog hais txog ib peb-pua pua ntawm chlorine.

Tom qab ntawd, lo lus nug yog, lub caij twg muaj 34 protons thiab 46 neutrons?

Lub npe Selenium
Atomic Mass 78.96 atomic mass units
Tus naj npawb ntawm Protons 34
Tus naj npawb ntawm Neutrons 45
Tus naj npawb ntawm Electrons 34

Tsis tas li ntawd nug, dab tsi yog cov lej ntawm lub sijhawm teem caij?

Tus lej saum lub cim yog atomic mass (los yog atomic hnyav). Qhov no yog tag nrho cov naj npawb ntawm protons thiab neutrons hauv ib lub atom. Tus lej hauv qab lub cim yog tus lej atomic thiab qhov no qhia txog tus naj npawb ntawm protons hauv lub nucleus ntawm txhua tus. lub ntsiab atom. Txhua keeb muaj tus lej atomic tshwj xeeb.

Dab tsi yog cov yam ntxwv ntawm selenium?

Lub crystalline (metallic) daim ntawv ntawm selenium muaj a melting point ntawm 217 ° C (423 ° F) thiab a kub point ntawm 685 ° C (1, 260 ° F). Nws ceev yog 4.5 grams ib cubic centimeter. Selenium los ntawm Greek lo lus rau lub hli, selene. Qee qhov tseem ceeb ntawm lub cev ntawm selenium yog nws cov khoom hluav taws xob.

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