首页
试卷库
试题库
当前位置:
X题卡
>
所有题目
>
题目详情
化学上用符号“X”表示原子的组成,其中X代表元素符号,Z表示原子核内的质子数,A表示原子核内质子数与中子数之和.已知Xn+和Ym﹣的核外电子数目相同,则下列关系正确的是( )
查看本题答案
包含此试题的试卷
教案备课库《》真题及答案
点击查看
你可能感兴趣的试题
XYZ和W代表原子序数依次增大的四种短周期主族元素它们满足以下条件①元素周期表中Z与Y相邻Z与W也相
X.Y.Z.W.为短周期的四种元素其最高正价依次为+1+3+5+7核电荷数按照Z.X.Y.W.的顺序
在宏观﹣微观﹣符号之间建立联系是学习化学的一种重要思维方式.如图是元素周期表中部分元素的原子结构示意
短周期元素X.Y.Z.L.M.的原子序数依次增大X.Y.Z.L.是组成蛋白质的基础元素其中Z.元素的
X.Y.Z.W.是原子序数依次增大的短周期主族元素且互不同族其中X.Y.为金属元素Z.W.为非金属元
短周期元素X.Y.Z.M.的原子序数依次增大元素X.的一种高硬度单质是宝石Y2+电子层结构与氖相同Z
WXYZ四种短周期元素的原子序数X>W>Z>YW原子的最外层没有p电子X原子核外s电子与p电子个数之
化学有自己的语言可以用国际通用的符号来表示物质的组成和变化.1元素符号是最基本的化学语言.硅的元素符
原子可以用符号AZX表示其中
A为原子质量数,Z为原子序数,X为原子种类符号
A为原子序数,Z为原子质量数,X为原子种类符号
A为原子种类符号,Z为原子质量数,X为原子种类序数
A为原子序数,Z为原子种类符号,X为原子质量数
A为原子种类符号,Z为原子质量数,X为原子序数
X元素原子的最外层电子数是次外层电子数的2倍Y和Z两种元素的阴离子的电子层结构和氩原子的电子层结构相
X.Y.Z.L.M.五种元素的原子序数依次增大X.Y.Z.L.是组成蛋白质的基础元素M.是地壳中含量
化学上用符号表示原子的组成其中X.代表元素符号Z.表示原子核内的质子数
表示原子核内质子数与中子数之和。已知
和
的电子层排布完全相同,则下列关系正确的是 ( ) A.b-a=d-c
a-n=c+m
a+n=c-m
b-n=d+m
在宏观﹣微观﹣符号之间建立联系是学习化学的一种重要思维方式.如图是元素周期表中部分元素的原子结构示意
X.Y.Z.是周期表中相邻的三种元素其中X.Y.同主族Y.Z.同周期此三种元素原子最外层电子数总和为
X.Y.Z.L.M.五种元素的原子序数依次增大X.Y.L.是油脂的组成元素Z.是空气中含量最多的气体
化学上用元素符号表示物质分子组成的式子称之为式
物理式
化学式
分子式
V.W.X.Y.Z.五种元素它们的核电荷数依次增大且都小于20其中X.Z.是金属元素V.和Z.元素原
化学有自己的语言可以用国际通用的符号来表示物质的组成和变化1元素符号是最基本的化学语言硅的元素符号是
按已知的原子结构规律82号元素X.应是第___________周期___________族元素它的最
化学有自己的语言可以用国际通用的符号来表示物质的组成和变化.1元素符号是最基本的化学语言.硅的元素符
热门试题
更多
1分﹣Whichoftheseshirtsdoyoulikebest? ﹣I'lltake.Theyareallexpensiveandoutoffashion. A.neither B.either C.none D.both
10分同学们即将告别紧张而忙碌的初三迎来两个月的暑假.是不是有一点点小激动?盐城晚报教育专刊将进行征文比赛请您畅谈暑假计划.请根据所给提示以MyPlanforThisSummerHoliday为题用英语写一篇短文参加比赛 注意:1词数:100词左右文章开头和结尾已给出不计入总词数; 2文中不能出现真实校名姓名等信息; 3文章必须包括表格所提供的信息并适当发挥注意行文连贯书写规范. MyPlanforThisSummerHoliday GradeThreewillbeoversoon.Thesummerholidayiscoming.Ithinkmanyofusfeelveryexcitedaboutit.Hereismyplanforholiday. Ihopethatallofuswillhaveagoodtimeduringthissummerholiday.
1分Anypersonwhodoessomethingthelawwillbeputintoprison.违反
10分根据短文内容及首字母提示填写所缺单词使短文意思完整每空限填一词. Anoldcarpenterwasreadytoretire.Hisbosswass1toseethegoodworkergo.Heaskedthecarpenterifhecouldbuildjustonemorehouse.Thecarpentersaidyesbuthism2wasnotonhisworkanymore. Heusedpoormaterialsandworkedonthehousec3.Whenthecarpenterfinishedhisworkthebosshandedthefront﹣doorkeytohim.Thisisyourhousehesaid.Ag4foryou. Whatasurprise!Whatashame!I5hehadknownhewasbuildinghisownhousehewouldhavedoneitdifferently.Nowhehadtoliveinthehomehehadpoorlybuilt.Soitiswithus.S6webuildourlivescarelessly.Atimportantpointswedonottryourbest.Thenwithashamewelookatthesituationwehavec7.Wefindthatwearenowlivinginthehousewehavepoorlybuilt.Butwedon'thaveachancetomakeitallovera8. Thinkofy9asthecarpenter.Thinkaboutyourlife.Builditwisely.Itistheonlylifeyouwilleverbuild.Lifeisado﹣it﹣yourselfproject. Yourlifetodayisther10ofyourattitudesandchoicesyoumadeinthepast.Yourlifetomorrowwillbethatofyourattitudesandchoicesyoumaketoday. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
1分Toeveryone'ssurpriseAlicesuccessinfindingajobinlessthanthreedays.
1分﹣Asanurseherworkgoestakingcareofherpatients. ﹣Yesshealwaysthinksofothers. A.beyond B.beside C.behind D.between
3分TheterribleaccidenthappenedonG15lastyearwascausedbydriver'scare.
1分Heoften借booksandmagazinesfromtheschoollibrary.
10分 IceBucketChallenge HaveyoueveryheardofALSIceBucketChallenge?Certainlyyoudo.ItisanactivityheldbyanAmericancharity.ItnotonlyhelpstheALSpatienttogetthemoneytotreattheirdiseasebutalsomakesmoreandmorepeopleknowaboutthediseasesothattheycangivemorecaretothepatients. IceBucketChallengebecamepopularonsocialmediaduringJuly﹣August2014intheUS.TheorganizerholdstheactivitytomakepeopleexperienceALSpatients'pain.Intheactivitypeopleneedtopourtheicewaterdownfromtheirheadsandthennominateanotherthreepeopletotakepartinthechallenge.Within24hourstheycanchoosetoacceptthechallengeordonate100dollarsordotheboth. ALSmakepeople'smusclebecomehard.Soitishardforthepatientstomove.StephenHockingafamousBritishphysicistisoneofthepatients.Thisactivitymakespeopleknowabouttheillnessandthepainthatthepatientssuffer.IceBucketChallengeisagreatsuccessuntilnowabigdonationhasbeenreceived.IhopemoreandmorepeoplecantakepartincharityactivitieslikeALSBucketChallengeanddowhatwecantohelpthosepatientsrecoversoon. Note:ALS﹣肌萎缩侧索硬化也叫运动神经元病 回答西面5个问题每题答案不超过7个词. 1.WhatisALSIceBucketChallenge? 2.WhendidALSIceBucketChallengebecomepopular? 3.Howmuchwillthepersondonateifheorshedoesnotacceptthechallenge? 4.WhyisithardforALSpatientstomove? 5.WhydoestheorganizerholdIceBucketChallenge?
﹣﹣﹣WhenyouPeter? ﹣﹣﹣I'mnotsure.Thereisalotoftrafficontheroadtoday. A.havearrived B.didarrive C.doarrive D.willarrive
1分Thesurvey.carriedoutinthatuniversityshowsthatthreefiveoftheteacherswearglasses.
15分WhenIwasinGrade3inprimaryschoolIwaschosentobetheprincessinaschoolplay.Icouldsaymylines16athomebutassoonasIwasonthestageeveryword17mymind. Finallymyteacherhadtoaskmetochangemy18.Ibecameanarrator.解说员Ididn'ttellmymotherwhathadhappenedwhenIwenthomeforlunchthatday.19shesensedmyunhappinessandasked20Iwantedtotakeawalkintheyard. Itwasalovelyspringday.Mymotherbentdownforsomedandelions.IthinkI'mgoingtodigupalltheseweedsshesaid.Fromnowonwe'llhaveonlyrosesinthegarden. ButIlikedandelions蒲公英Isaid.Allflowersarebeautiful﹣﹣﹣21dandelions. Mymotherlookedatmeseriously.Yeseveryflowerisbeautifulisn'tit?sheasked.I22.Andthatistrueofpeopletoosheadded.Not23canbeaprincessbutit'snotashame. Shehadsensedmypain.Istarted24andtoldherwhathadhappened.Shelistenedandsmiled. Butyouwillbeabeautifulnarratorshesaid.Thepartofthenarratorisas25asthepartoftheprincess. OverthenextfewweekswithherencouragementIlearnttotake26intheroleandworkedhardtoreadovermylines. Afewminutes27theplayIfeltverynervousandthenmyteachercameovertome.Yourmotheraskedmetogivethistoyoushesaid28meadandeliononeofthelittleflowersinmygarden.AssoonasIsawitI29andbecameconfident.AftertheplayItookhometheflowerandpressedit30twosheetsofpaperinadictionary. 16.A.slowly B.quickly C.easily D.quietly 17.A.wentawayfrom B.cameinto C.wentthrough D.ranto 18.A.mind B.role C.way D.job 19.A.So B.And C.Or D.But 20.A.why B.if C.what D.when 21.A.even B.still C.yet D.also 22.A.answered B.nodded C.agreed D.shook 23.A.anybody B.somebody C.nobody D.everybody 24.A.cry B.crying C.laugh D.laughing 25.A.necessary B.beautiful C.important D.good 26.A.part B.interest C.pride D.chance 27.A.before B.during C.after D.while 28.A.handed B.handing C.hand D.tohand 29.A.camedown B.calmeddown C.putdown D.felldown 30.A.around B.among C.behind D.between
Manypeopledonotrealizetheimportanceofhealththeyhavefallenill. A.since B.until C.while D.after
﹣﹣﹣It'sreportedthatover240peoplediedintheColumbiaLandslide泥石流onApril3rd. ﹣﹣﹣badnews! A.What B.How C.Whata D.Howa
1分﹣﹣WhatdidTomsaytoyoujustnowJohn? ﹣﹣Heasked. A.whyIamsohappytoday B.whatwillIdofortheweekend C.WhodidIplayfootballwithafterschool D.ifIcouldgotothemoviewithhimtonight
﹣﹣﹣Doesyoursisterlikehernewjob? ﹣﹣﹣Ithinkso.Sheworksandshefeels. A.hardhappy B.hardlyhappily C.hardhappily D.hardlyhappy
1分﹣Thestuntmanisplanningtowalkonthewingsofaflyingplane. ﹣What?!I'veneverheardofideabefore. A.acrazier B.thecrazier C.acraziest D.thecraziest
1分BeforeJulieleftMrs.GriffinsaidYou'dbettertakeanumbrellawithyou. Lookatthedarkcloudsinthesky.Itrain. A.can't B.need C.mustn't D.might
10分Asaparentit'snecessarytoknowhowtobestsupportyourchildinschool.Todaywe'lltalkabouthowyoucansupportyourchild. 1Yourchildwillbetired.Thenewschoolyearmeansawhilenewschedule进度表sowiththeperiodmaycomeabitoffatigue. Youshould: ●Makesureyourchildgetenoughsleep. ●Prepareandpackintheeveningforthenextdayofschool. 2Yourchildmayfeelnervous.Everythingisnew!Everythingisdifferent! Youshould: ●Talktalktalk!Askaboutthedayandaskhowhe'sfeeling. ●Knowyourchild.Maybeheneedsabitoftimeafterschoolandwantstotalkintheeveningormaybehe'stiredintheeveningandwantstochatafterschool.Finditoutanfollow! 3Yourchildwantstodowell.Hereallydoes.Rememberthatnomatterwhatlastyearlookedlikethisyearisafreshandnewstart! Youshould: ●Makeitclearthatyouwanttohelphim. ●Celebratesuccesses! 4Yourchildreallyneedsyou.Nomatterwhathesaysyourchildneedsyou.Youshould: ●Betherewhenheneedsyou. ●Knowwhatisgoingon.Knowwhatyourchildneedsforclassandgetitforhim. 1.WhatdoestheunderlinedwordfatiguemeaninChinese? A.疲倦 B.亢奋 C.尴尬 D.孤独 2.Whatshouldparentsdoiftheirchildfeelsnervous? A.Tellhimtogetenoughsleep. B.Havearelaxingchatwithhim. C.Tellhimtobeindependent. D.Geteverythingreadyforhim. 3.Whatcanbethebesttitleforthepassage? A.Learntoletgo B.Schoolchildrenarenoteasy C.Problemsofschoolchildren D.Waystosupportschoolchildren 4.Wecanprobablyfindthereadinginanmagazine. A.travel B.business C.education D.sports 5.Whomightbeinterestedinthisreading? A.Students. B.Parents. C.Teachers. D.Doctors.
1分Grandmawenttothemarketandboughtsomemeateggsand西红柿forlunch.
1分一HowwasyourMayDayholiday? 一Justso﹣so.WedrovetoSuzhouandtriedtofindaplaceforparkingbuttheywereall. A.turnedup B.takenup C.stayedup D.putup
10分任务型阅读 WehavealwaysbeeninterestedintheMoon.2000yearsagopeoplealreadyknewitcirclesaroundtheEarthanditisindifferentplacesintheskyatdifferenttimesoftheyear.AtthattimeeverythingabouttheMoonwaslearnedbywatchingitcarefullyinthesky. Whenscientistscouldusetelescopes望远镜tostudytheMoonmoreclearlytheirideasbegantochange.TheycouldseethattherewerelotsofrocksonthesurfaceoftheMoon.MostscientiststhoughtMoonrockswouldbedifferentfromtherocksontheEarth. In1969MoonrockswerefinallybroughttotheEarthandstudied.MuchtotheirsurprisescientistsfoundthatexceptforwatertheMoonandtheEarthweremadeofthesamethings.Onceagainnewideascameoutaccordingtothenewinformation. AfteryearsofstudymostscientistsnowthinkthattheMoonwasoncepartoftheEarth.Theybelieveabout4millionyearsagosomethingofthesamesizeasMarshittheEarth.ThissentbillionsofrocksintospacearoundtheEarth.TheserocksslowlyjoinedtogetherandatlastbecametheMoon. InthefutureourideasabouttheMoonmaychangeagain.HoweverwewillstillbeinterestedintheMoon. 根据短文内容完成下列表格每空一词. Scientists'1abouttheMoon 2000yearsagePeoplealreadyknewtheMoonmovesaroundtheEarthandit'sindifferentplacesintheskyatdifferenttimesoftheyear. PeoplewatchedtheMooncarefullyto2aboutit. WhenscientistscouldusetelescopesThey3lotsofrocksonthesurfaceoftheMoon. Theybelievedtherewouldbe4betweenMoonrocksandtherocksontheEarth. In1969MoonrockswerefinallybroughttotheEarthfor5. Scientistsfoundthatexceptforwaterthe6andtheEarthweremadeofthesamethings. NowMostscientiststhinkthattheMoonwasoncepartofthe7. It's8that4millionyearsagesomethinghittheEarthandbillionsofrocksweresentintospace. Thentherocksslowlyjoinedtogetherand9theMoonformed. Inthefuture10maytakeplaceinpeople'smindabouttheMoonagain. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
﹣﹣﹣Whatdoyouthinkoffilmthatyousawyesterday? ﹣﹣﹣Sogreat.I'veneverseenbetterone. A.thea B.thethe C.athe D.aa
Arecentresearchsaysthatofthewaterinthenortherncitypolluted. A.twothirdshas B.twothirdsis C.twothirdare D.twothirdshave
3分Ifyouanswerallthequestionscorrectyouwillhaveachancetoachievetheaward.
1分最后thegovernmentcontrolledthespreadofthedisease.
Atthesciencemuseumthekidsgettoknow. A.whatisthespacerobotlike B.whatthespacerobotlookslike C.howdoesthespacerobotlike D.howthespacerobotlookslike
1分Manycountriesspeak高度地ofChina'shigh﹣speedrailwaytechnologies.
3分InNorthIndiamillionofpeopleissufferingfromdryweather.
1分﹣﹣﹣Whatdoyouthinkofthevegetablesoup?﹣﹣﹣Wellitalittlesalty.A.looks B.smells C.sounds D.tastes
热门题库
更多
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
教案备课库
高一下学期数学
教案备课库
高一上学期数学
高一上学期化学
教案备课库
教案备课库
教案备课库