1- Elements and atomic structure

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1、Elementandatomicstructure/Section1/Sect1pp.doc/S.W.Tse/P.185Q.1oAsubstanceXmeltsat1600C.Itsdoesnotconductelectricityinthesolidorinthemoltenstate.XprobablyhasA.anionicstructure.B.agiantcovalentstructure.C.asimplemolecularstructure.D.ametallicstructure.85Q.3Thetablebelowshowsthenumberof

2、neutronsandelectronsinthefollowingfiveatoms/ions:atoms/ionsnumberofneutronsnumberofelectronsP882+Q12102-R1010+S1210T89WhichofthefollowingatomsisanisotopeofP?A.QB.RC.SD.T85Q.4Whichofthefollowingpairsofatomicnumbersrepresentselementswithsimilarchemicalproperties?A.3and12B.9and16C.6and17

3、D.12and2085Q.7Lead(II)chloridedoesnotconductelectricityatroomtemperaturebecauseA.itisacovalentcompound.B.itisinsolubleinwater.C.itdoesnotcontainions.D.itsionsarenotmobile.85Q.29ManycovalentcompoundsareliquidsorAllcovalentbondsareweakbonds.gases.1ststatement2ndstatementA.TrueTrue2ndsta

4、tementisacorrectexplanationofthe1stone.B.TrueTrue2ndstatementisNOTacorrectexplanationofthe1stone.C.True/FalseFalse/TrueOnlyONEofthestatementsistrue,theotherisfalse.D.FalseFalse-----Elementandatomicstructure/Section1/Sect1pp.doc/S.W.Tse/P.285Q.36Whichofthefollowingmoleculeshasonlyonelo

5、nepairofelectrons?A.C2H4B.NH3C.H2OD.HBr86Q.2Themeltingpointsofdiamond,sodiumchlorideandpotassiumincreaseintheorder:A.diamond,sodiumchloride,potassiumB.potassium,sodiumchloride,diamondC.sodiumchloride,diamond,potassiumD.sodiumchloride,potassium,diamond86.Q.9ElementXandYhaveatomicnumber

6、s8and12respectively.TheformulaforthecompoundformedbetweenXandYwouldbeA.YXB.Y2XC.YX2D.Y2X386Q.11Whichofthefollowingmoleculeshasthegreatestnumberoflonepairsofelectrons?A.ammoniaB.hydrogenfluorideC.methaneD.water86Q.37Themeltingpointsofsomechloridesaregivenbelow:oNaCl801CoMgCl2712CoSiCl4

7、-68CWhichofthefollowingstatementswouldbeconsistentwiththeabovedata?o(1)NaClcanconductelectricityat810C.o(2)MgCl2isaliquidat600C.(3)SiCl4isacovalentcompound.A.(1)onlyB.(2)onlyC.(1)and(3)onlyD.(2)and(3)onlyElementandatomicstructure/Section1/Sect1pp.doc/S.W.Tse/P.386Q.387981Bromineexists

8、intwo