CambridgeInternationalASandALevelChemistry OriginalmaterialCambridgeUniversityPress2011 1

Worksheet2.1

Subatomicparticles

1 Thestructureoftheatomcanbedescribed using certainkey terms.Usethe termsinthemiddlecolumnofthetablebelow towritetwo shortparagraphsonthestructureoftheatomanditsimportance.

Paragraph Termstouse Marksallocated

a Thethree particlesandtheirproperties electronneutronprotonrelativechargerelativemasssubatomicparticlesnocharge

[6]

b Thearrangementoftheparticlesinthe atom

electrons

energylevelsprotonsneutronsnucleonsnucleus

[3]

2 Describethesubatomicstructureofanatomof 10848Cd .Youdonotneedtodescribetheexactarrangementoftheelectrons. [8]

3 Separatebeamsofelectrons,neutronsandprotonsare firedintoanelectricfieldproducedbytwocharged platesasshowninthediagram.

a Whichofthesethreetypesofparticlewillbedeflectedthemost? [1]b Explainyouranswertopart a. [2]c Inwhichdirection,ifany,willeachofthese typesofparticlesbedeflected? [2]d Whatistheimportanceofproton numberinthestructureofthePeriodicTable? [1]

4 Isotopescanbemadebyfiringstreamsofneutronsandprotonsatthenucleusofspecificatoms.Theneutronsorprotonscollidewiththenucleusofthetargetatom andcauseittobreakup.Explainwhyneutronsaremoreeffectivethanprotonsinbreakingupthenucleus. [2]