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1、四川大学考研bbs（www.scuky.net/bbs）欢迎您报考川大！《材料科学与工程基础》英文习题及思考题及答案第二章习题和思考题QuestionsandProblems2.6Allowedvaluesforthequantumnumbersofelectronsareasfollows:TherelationshipsbetweennandtheshelldesignationsarenotedinTable2.1.Relativetothesubshells,l＝0correspondstoanssubshelll＝1correspondstoapsubshelll＝2correspo
2、ndstoadsubshelll＝3correspondstoanfsubshellFortheKshell,thefourquantumnumbersforeachofthetwoelectronsinthe1sstate,intheorderofnlmlms,are100(1/2)and100(-1/2).WritethefourquantumnumbersforalloftheelectronsintheLandMshells,andnotewhichcorrespondtothes,p,anddsubshells.2.7Givetheelectronconfigurationsfort
3、hefollowingions:Fe2+,Fe3+,Cu+,Ba2+,Br-,andS2-.2.17(a)Brieflycitethemaindifferencesbetweenionic,covalent,andmetallicbonding.(b)StatethePauliexclusionprinciple.2.18Offeranexplanationastowhycovalentlybondedmaterialsaregenerallylessdensethanionicallyormetallicallybondedones.2.19Computethepercentsionicch
4、aracteroftheinteratomicbondsforthefollowingcompounds:TiO2,ZnTe,CsCl,InSb,andMgCl2.2.21UsingTable2.2,determinethenumberofcovalentbondsthatarepossibleforatomsofthefollowingelements:germanium,phosphorus,selenium,andchlorine.2.24Onthebasisofthehydrogenbond,explaintheanomalousbehaviorofwaterwhenitfreezes
5、.Thatis,whyistherevolumeexpansionuponsolidification?3.1Whatisthedifferencebetweenatomicstructureandcrystalstructure?3.2Whatisthedifferencebetweenacrystalstructureandacrystalsystem?3.4Showforthebody-centeredcubiccrystalstructurethattheunitcelledgelengthaandtheatomicradiusRarerelatedthrougha=4R/√3.3.6
6、ShowthattheatomicpackingfactorforBCCis0.68..3.27*Showthattheminimumcation-to-anionradiusratioforacoordinationnumberof6is0.414.Hint:UsetheNaClcrystalstructure(Figure3.5),andassumethatanionsandcationsarejusttouchingalongcubeedgesandacrossfacediagonals.3.48Drawanorthorhombicunitcell,andwithinthatcella[
7、121]directionanda(210)plane.四川大学考研bbs（www.scuky.net/bbs）欢迎您报考川大！3.50Hereareunitcellsfortwohypotheticalmetals:(a)Whataretheindicesforthedirectionsindicatedbythetwovectorsinsketch(a)?(b)Whataretheindice
