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PracticePacket:Unit4AtomicConcepts
RegentsChemistry:Mr.Palermo
PracticePacketUnit4:Atomics
Vocabulary:_______________Intro________________________Lesson1:__________________Inquiry_____________________Lesson2:__________________Lesson3:__________________Lesson4:__________________Lesson5:__________________Lesson6:__________________Lesson7:__________________
PracticePacket:Unit4AtomicConcepts
Vocabulary
Foreachword,provideashortbutspecificdefinitionfromYOUROWNBRAIN!Noboringtextbookdefinitions.Writesomethingtohelpyouremembertheword.Explainthewordasifyouwereexplainingittoanelementaryschoolstudent.Giveanexampleifyoucan.Don’tusethewordsgiveninyourdefinition!
Alphaparticle:_______________________________________________________________________________________________________
Anion:_________________________________________________________________________________________________________________
Atom:_________________________________________________________________________________________________________________
AtomicMass:_________________________________________________________________________________________________________
AtomicNumber:_____________________________________________________________________________________________________
Bohr:_________________________________________________________________________________________________________________
BrightLineSpectra:_________________________________________________________________________________________________
Cation:________________________________________________________________________________________________________________
Deflected:_____________________________________________________________________________________________________________
ElectronConfiguration:_____________________________________________________________________________________________
Electron:_____________________________________________________________________________________________________________
ExcitedState:_________________________________________________________________________________________________________
Goldfoilexperiment:________________________________________________________________________________________________
GroundState:_________________________________________________________________________________________________________
Isotope:_______________________________________________________________________________________________________________
MassNumber:_______________________________________________________________________________________________________
Neutron:_____________________________________________________________________________________________________________
Nuclearcharge:______________________________________________________________________________________________________
PracticePacket:Unit4AtomicConcepts
Nucleus:_____________________________________________________________________________________________________________
Orbital:_______________________________________________________________________________________________________________
Proton:_______________________________________________________________________________________________________________
Rutherford:___________________________________________________________________________________________________________
Thompson:___________________________________________________________________________________________________________
ValenceElectrons:___________________________________________________________________________________________________
WaveMechanicalModel:____________________________________________________________________________________________
PracticePacket:Unit4AtomicConcepts
IntroductiontoAtomicModels
Background:
Modelsareusedinscienceasawaytorepresentwhatwecannotsee.Theyhelpusworkwith,visualize,andunderstandscientificconcepts. However,modelsareconstantlychangingaswedevelopnewtechnologyandcontinuetomakeadvancements.Wearegoingtostudytheatominthisunit,anditisimportanttolearnabouttheprocessofdevelopingourmostcurrentmodel.
Model1: Dalton
Daltoncameupwiththetheorythatdescribedatomsinfivepostulates,meaning,asetofconceptsortheoriesproposedbyscientists. Daltonusedexperimentationtodevelophispostulatesthroughtestinggases. Hefirstdifferentiatedatomsviaatomicweight.Hisdatawasflawed,however,butheisknownasthefatherofatomictheoryduetohisimmensestridesinthistopic. Hisfivepostulatesarelistedbelow:
i. Allelementsarecomposedoftinyindivisibleparticlescalledatomsthatcannotbebrokendownfurther. *
ii. Atomsofagivenelementareallsimilarintheirphysicalandchemicalproperties. *iii. Atomsofdifferentelementsdifferintheirphysicalandchemicalproperties.iv. Atomsofdifferentelementscombineinsimple,wholenumberratiostoformcompounds.v. Inchemicalreactions,atomsarecombined,separated,orrearranged,butnevercreated,destroyed,or
changed.* ***indicatesthatthepostulatestillholdstruetoday
Dalton’smodelsummarizestheseprinciplesbyshowingthatanatomismadeupofsolid,indivisibleparticles. ThiswasoriginallystatedbyGreekphilosopherDemocritus,andhecalledtheindivisibleparticleatomos(whichmeansindivisible).However,Democritusdidnothaveanysupportforhisclaim.
KeyContentQuestions:
1. EventhoughnewmodelswerediscoveredafterDaltoncreatedhisfiveprinciples,whichoftheseprinciplesstillholdstrue? (actuallywritethemout)
Dalton’smodelof
theatom:
PracticePacket:Unit4AtomicConcepts
Model2: JJThomson
Usingacathoderaytube,JJThomsondiscoveredtheelectron.Acathoderaytubeis
composedofacathodeornegativeelectrode,andananodeorpositiveelectrodeinsideofanevacuatedglasscontainer. (Electrodesaremetalplateswithpositiveornegativechargesonthesurface).Thomsonappliedachargetothecathoderayandobservedtheflowofelectronsfromcathodetoanodethroughtheopenspaceofthecontainer.Theseobservationschangedthewaythatatomswereportrayedsinceitwasnowdeterminedthatatomscouldbefurtherbrokendown.
Thomson’smodelshowselectronsscatteredthroughoutanatomthatismostlyapositively-chargedcloud.Inadditiontothebeamtravelingfromthenegativecathodetothepositiveanode,Thomsonputamagneticfieldonthetubeandnoticedthebeamwasattractedtothepositiveendofthefield. Thisallowedhimtoconcludetherearenegativelychargedparticlesintheatom.Thomsonalsoconcludedthattheremustbeanopposingpositivechargesurroundingthenegativecharge.
Thomson’s“PlumPudding”Model:
PracticePacket:Unit4AtomicConcepts
KeyContentQuestions:
2.WhatdidThomsondeterminethechargeofanelectrontobe?(positiveornegative)
3.Howdidhedeterminethischargebasedonhisexperimentation?
Model3: RutherfordIn1911,themodeloftheatomchangedonceagainafterErnestRutherforddiscoveredthe
nucleus.Rutherfordaimedalphaparticles(positivelychargedparticlesthatrepresentaheliumnucleus)atathinsheetofgoldfoil. BasedonThomson’smodel,heexpectedtheparticlestotravelstraightthroughthefoil. However,thiswasnotthecase.
Rutherfordobservedsomeparticlesthatwentstraightthrough,buthealsonoticedsomedeflectionsbacktowardshimandofftotheside.Thisshowedthatprotonsandelectronswerenotevenlydispersed.Rutherforddeterminedthatprotonsarelocatedinaconcentratedareainthecenterofatom,andtheelectronsaredispersedintheemptyspacearoundit.
ThismeansthatThomson’smodelwasnolongercorrect,andthatprotonswerefoundinadenseareaoftheatomcalledthenucleus.Electrons,ontheotherhand,arefoundintheemptyspacearoundtheatom.
PracticePacket:Unit4AtomicConcepts
KeyContentQuestions:
4.WhatdidRutherfordexpecttohappeninhisexperiment?
5.Whatactuallyhappened? Whatdidthismeanaboutthemake-upoftheatom?
6.WhatpartoftheatomisRutherfordcreditedfordiscovering?
Model5:Bohr
In1912,NielsBohrcameupwithatheorythatexplainedwhyelectronsdonotspiralinward(astheyshouldbaseduponclassicalphysicsandparticlemovement).Hestatedthatelectronsfollowtworules.
1. Electronsorbitatspecificdistancesfromthenucleus.Inotherwords,allelectronscanbefoundatacertaindistancefromthenucleusinanorbital.
2. Atomsradiate(giveoff)energywhenanelectronjumpsfromahigher-energyorbittoalower-energyorbit,andabsorbs(takein)energywhentheelectrongetsboostedfromalow-energyorbittoahigh-energyorbit.
Rutherford’sModeloftheatom:
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Thismodelisknownastheplanetarymodelsincetheelectronsareorbitingaroundthenucleusmuchliketheplanetsorbitaroundthesun. Thefirstorbitalonlyholdstwoelectrons.Orbitaltwocanholduptoeightelectrons,orbitalthreecanholduptoeighteenelectrons,andorbitalfourandhighercanholduptothirty-twoelectrons.(2-8-18)
KeyContentQuestions:
Whatarethecirclesaroundthenucleuscalled?
Whatparticleresidesinthem?
Howcanelectronsmovefromoneorbitaltoanother?
Model6: Today’sModel…QuantumMechanicalModel
Fifteenyearspassedbeforeanothermodeloftheatomwasputintothemix.Thenextmodel,thequantummechanical(electroncloud)model,isamathematicalmodelthatpredictstheprobabilityofelectronlocationsandpathswithinanelectroncloud.ThismodelresultedfromscientistssuchasdeBroglie,Schrödinger,andHeisenberg. Thesescientistsstartedtolookatelectronsactingasbothparticlesandwaves,anddeterminedthattherecanbenocertaintyinfindingthepositionofanelectronifyouknowthemomentumatwhichittravels.Thisledtotheideaofelectronsexistinginanelectroncloudmovingasbothaparticleandawaveatthesametime.Hencecamethequantummechanicalmodel.
Bohr’sModeloftheAtom:
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QuantumMechanicalModel:
KeyContentQuestions:
IntheQuantumMechanicalmodel,howdoelectronstravel?Wherearetheylocated?
ExtensionQuestion:
Labelthemodels(Dalton,Thomson,Rutherford,Bohr,orQuantumMechanicalmodel).
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LESSON1:ATOMICTHEORY
ObservationofThompson’splumpuddingmodel:Gotohttps://phet.colorado.edu/sims/html/rutherford-scattering/latest/rutherford-scattering_en.htmlandclickonplumpuddingmodel.Clickonthebluebuttononthegunontheleftsidelabeled“alphaparticles.”Observewhatisoccurringandanswerthequestionsbelow.
1. AccordingtowhatyouobservedaboutThompson’splumpuddingmodel,whatwashappeningwiththealphaparticles?
2. Isthismodelaccuratefromwhatyounowknowaboutthestructureoftheatom?ObservationofRutherford’sModel:Gotohttps://phet.colorado.edu/sims/html/rutherford-scattering/latest/rutherford-scattering_en.htmlandclickonRutherfordAtom.Thenclickonthebluebuttononthegunontheleftsidelabeled“alphaparticles.”Observewhatisoccurringandanswerthequestionsbelow.
1. Asthepositivelychargedalphaparticlesareshotatthegoldfoilwhathappenstomostoftheparticlesbaseduponthesimulation?
2. Doallparticlespassrightthroughtheatomsundeflected?
3. Whatcanyouconcludeaboutthechargeofthenucleusfromthesimulation?Whataboutthesize?
Objective:• Describehowthemodernmodeloftheatomhasevolvedoveralongperiodoftimethrough
theworkofmanyscientists• Relateexperimentalevidencetomodelsoftheatom• DescribeindetailRutherford’sExperimentandtheconclusionshemade
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DevelopmentoftheModeloftheAtomUsingyournotes,drawamodelforeachofthefollowing:
Dalton Thompson Rutherford Bohr
1.)J.J.Thomson’sCathodeRayTubeexperimentledtothediscoveryof
1. thepositivelychargedsubatomicparticlecalledtheelectron2. thepositivelychargedsubatomicparticlecalledtheproton3. thepositivelychargedsubatomicparticlecalledtheelectron4. thenegativelychargedsubatomicparticlecalledtheelectron
2.)AccordingtotheBohrModel,
1. electronsarefoundinareasofhighprobabilitycalledorbitals2. electronstravelaroundthenucleusincircularpathscalledorbits3. electronsarefoundinareasofhighprobabilitycalledorbits4. electronstravelaroundthenucleusinrandompathscalledorbitals
3.)AccordingtotheWave-MechanicalModel,
1. electronsarefoundinareasofhighprobabilitycalledorbitals2. electronstravelaroundthenucleusincircularpathscalledorbits3. electronsarefoundinareasofhighprobabilitycalledorbits4. electronstravelaroundthenucleusinrandompathscalledorbitals
4.) In Thomson’s cathode-ray experiment, what evidence led him to believe that the ray consisted of particles, and why did he conclude that the ray was negatively charged?
REGENTSPRACTICE
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5.)Onemodeloftheatomstatesthatatomsaretinyparticlescomposedofauniformmixtureofpositiveandnegativecharges.Scientistsconductedanexperimentwherealphaparticleswereaimedatathinlayerofgoldatoms.Mostofthealphaparticlespasseddirectlythroughthegoldatoms.Afewalphaparticlesweredeflectedfromtheirstraight-linepaths.Anillustrationoftheexperimentisshownbelow.
a. Mostofthealphaparticlespasseddirectlythroughthegoldatomsundisturbed.Whatdoesthisevidencesuggestaboutthestructureofthegoldatoms?
b. Afewofthealphaparticlesweredeflected.Whatdoesthisevidencesuggestaboutthestructureofthegoldatoms
c. Howshouldtheoriginalmodelberevisedbasedontheresultsofthisexperiment?
6.) In1897,J.J.Thomsondemonstratedinanexperimentthatcathoderaysweredeflectedbyanelectricfield.Thissuggested
thatcathoderayswerecomposedofnegativelychargedparticlesfoundinallatoms.Thomsonconcludedthattheatomwasapositivelychargedsphereofalmostuniformdensityinwhichnegativelychargedparticleswereembedded.Thetotalnegativechargeintheatomwasbalancedbythepositivecharge,makingtheatomelectricallyneutral.Intheearly1900s,ErnestRutherfordbombardedaverythinsheetofgoldfoilwithalphaparticles.Afterinterpretingtheresultsofthegoldfoilexperiment,Rutherfordproposedamoresophisticatedmodeloftheatom.
a. StateoneconclusionfromRutherford’sexperimentthatcontradictsoneconclusionmadebyThomson.
b. StateoneaspectofthemodernmodeloftheatomthatagreeswithaconclusionmadebyThomson.
7.)Intermsofelectrons,whatcanweconcludeaboutthecurrentmodeloftheatom?
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INQUIRYACTIVITY:BUILDINGANATOM
Go to https://phet.colorado.edu/sims/html/build-an-atom/latest/build-an-atom_en.html and click “atom.”
Build an Atom Before running the simulation, check off “stable” and click the + sign next to mass number and net charge. Then build 3 different examples of atoms that have a stable nucleus and fill in the table below.
Numberofparticlesin
yournucleus:Draw
yournucleusWhatelement
isit?
1.Protons:1Neutrons:1
2.
Protons:2Neutrons:2
3.
Protons:3Neutrons:4
1. Which particle (or particles) determines the name of the element you built?
Test your idea by identifying the element for the 3 cases.
Particles ElementSymbol?
MassNumber
WhatParticledeterminestheIdentityofthe
Element?
Nametheelement
1.Protons:6Neutrons:6Electrons:6
�Proton�Neutron�Electron
2.Protons:7Neutrons:6Electrons:6
�Proton�Neutron�Electron
3.Protons:6Neutrons:7Electrons:7
�Proton�Neutron�Electron
a. What sub atomic part affects the mass of your atom?
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b. What is a rule for determining the mass? c. Using all of your rules, figure out what changes for each of these actions to an atom. You can test
your ideas with the simulation. If you have new ideas, rewrite your rules.
Start the simulation with 3 protons, 4 neutrons and 3 electrons
Action WhatChanges? HowDoesitaffecttheatom?
AddaProton
�Element
�Charge �Mass
Action WhatChanges? Howdoesitaffecttheatom?
RemoveaNeutron
�Element
�Charge �Mass
Action WhatChanges? Howdoesitaffecttheatom?
RemoveanElectron
�Element �Charge �Mass
Action WhatChanges? Howdoesitaffecttheatom?
AddaElectron
�Element
�Charge �Mass
SubatomicParticles:
SubatomicParticle Charge Mass
Proton
Electron
Neutron
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LESSON2:SUBATOMICPARTICLES
FillinthetablebelowusingtheperiodictableandtableSinyourreferencetable.
Name Symbol Protons Neutrons ElectronsAtomic
#
Mass#Thisisp+n
Hydrogen 0 1 1
He 2 4
Carbon C 6 12
Nitrogen 7 7 7
Oxygen O 8 8 8
Aluminum 14 13 27
Iron 26 30
Co 27 59
Lithium 4
Beryllium Be 4 4 9
Boron 5 11
Ne 10
Sodium 11 12
Fluorine 9 10
Thetermnuclearchargerepresentsthenumberandsignofthechargeinsidethenucleus.Protonswhichare__________________chargedandneutronswhichare__________________charged,areinthenucleus.Thismeansthenucleusisalways______________charged.The#ofnucleonsisthenumberofparticlesinthenucleus________________________plus_______________________________.
Objective:• Identifythesubatomicparticlesofanatom(proton,neutron,andelectron)• Determinethenumberofprotons,neutrons,electrons,nucleonsandnuclearchargeina
neutral atom
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Completethetablebelow(allareneutral):
1. Thenumberofprotonsinthenucleusof 32Pis:15
(1)15(2)17 (3)32 (4)47
2. Whatisthetotalnumberofelectronsinanatomwithanatomicnumberof13andamassnumberof 27?
(1)13(2)14 (3)27 (4)40
3. Themassnumberofanatomisequaltothetotalnumberofits(1) electronsonly(2)protonsonly(3)electronsandprotons (4)protonsandneutrons
4. Whatisthetotalnumberofneutronsinanatomof39K? 19
(1)1(2)20(3)39(4)58
5. Theatomicnumberofanatomisalwaysequaltothetotalnumberof(1) neutronsinthenucleus (2)protonsinthenucleus(3)neutronsplusprotonsintheatom (4)protonspluselectronsintheatom
Atom
Protons Electrons Neutrons Mass#
Atomic#
Nuclearcharge
#ofNucleons
Nucleardiagram
Element’sSymbol
A 44 101 +44 57n44p
B 84 125
C 55 Mn
D 89 227
E 31 +28
F 92 238
G 81
Ba
REGENTSPRACTICE
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LESSON#3:IONS
Cationsare_____________chargedbecausethey______________________________whenbonding. (positively/negatively) (gain/lose)(electrons/protons)
Anionsare_____________chargedbecausethey______________________________whenbonding. (positively/negatively) (gain/lose)(electrons/protons)
• Ifaparticlehas9protonsand10electrons,whatisthesymbolandcharge?___________• Ifaparticlehas11protonsand10electrons,whatisthesymbolandcharge?___________• Ifaparticlehas12protonsand10electrons,whatisthesymbolandcharge?___________
Giveamathematicalrulefordeterminingthechargeofaparticle:____________________________________
1.Completethefollowingtable
Name Symbol Protons Neutrons Electrons Atomic# Mass#
Copperion
Cu+2 29 35 64
Bariumion
Ba+2 56 137
K+ 39
Goldion
Au+3 118 79
Chlorideion
18 18 17
Fluorideion F- 10
Sulfideion S-2 16
O-2 16
Aluminumion
13 10 27
Objective:• Determinethenumberofprotons,neutrons,andelectronsinanion
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Sinceallatomsstrivetobecomestable(8electronsintheirvalenceshell)whentheygainorloseelectronstoformionstheybecomestable.TheresultingelectronconfigurationoftheionistheSAMEasthatofanoblegas.Forexample,lookattheelectronconfigurationofoxygen.
Theunstableatomofoxygenhasanelectronconfigurationof2-6.
Tobecomestabletheatomgains2valenceelectronsresultingin8valenceelectronsandanelectronconfigurationof2-8whichisthesameconfigurationasthenoblegasNeon.
*****rememberwhenanatomformsanionitdoesn’tbecomeanoblegasitjusthasthesameconfigurationasone.Theprotonandneutronsdonotchangefromatomtoionandthereforewillbedifferentthanthenoblegas.2.CompletethefollowingTable
Ion Charge #ofprotons
#ofelectrons
Electronconfiguration
ElectronConfigurationsameas…
Ionlargerorsmallerthan
atom?Al3+ +3 13 10 2-8 Ne(2-8) smaller
P3-
Sr2+
Na+ +1 -2 8
F-
3.Explain,intermsofsubatomicparticles,whyanoxygenatomiselectricallyneutral.
4.Explain,intermsofsubatomicparticles,whyanoxideion,O2-,hasanegativecharge.
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5.Comparethenumberofprotonstothenumberofelectronsinapositiveion.
6.Comparethenumberofprotonstothenumberofelectronsinanegativeion.
7.Explain,intermsofsubatomicparticles,whyachlorineionislargerthanachlorineatom
REGENTSPRACTICE
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LESSON#4:BOHRDIAGRAMS
Bohrdiagramsshowthenumberofprotonsandneutronsinthenucleusandthenumberofelectronsintheirenergylevels.Theelectronconfigurationshowshowmanyelectronsareineachlevelinthegroundstate,orundernormalconditions.
DrawtheBohrdiagramsofthefollowingatoms:Thenon-shadedboxesarepositiveions&theshadedboxesarenegativeions.
H-1
K-40 Li-7 Be-9
F-19
Cl-35 P-31 S-28
Objective:• ConstructBohrdiagramsforatomsandions
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DrawtheBohrDiagramsforthefollowingions:Thenon-shadedboxesarepositiveions&theshadedboxesarenegativeions.
H+1
K+1 Li+1 Be+2
F-1
Cl-1 P-3 S-2
1. DrawtheBohrdiagramforBandMg+32. Whenanatomformsapositiveion,doesthesizegetlargerorsmaller?Explain.
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3. DrawtheBohrdiagramforSandS-24. Whenanatomformsanegativeion,doesthesizegetlargerorsmaller?Explain.
REGENTSPRACTICE
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LESSON#5:ISOTOPESANDAVERAGEATOMICMASSIntermsofsubatomicparticles,isotopesareatomsofthesameelement,whichhaveadifferentnumberof___________________butthesamenumberof________________.Thusthe___________________numberisthesamebutthe______________numberisdifferent.Isotopenamescanbefollowedbythemassnumber.Example:Carbon-14andCarbon-12.Isotopesymbolsincludetheelement’ssymbolwiththemassnumberonthetopleftandtheatomicnumberonthebottomleft.Example:146Cand126C
Name IsotopeSymbol
AtomicMass
AtomicNumber Neutrons Protons Electrons Nuclear
ChargeLithium-6
Lithium-7
Boron-10
Boron-11
Sodium-22
Sodium-24
Aluminum-26
Aluminum-27
Iron-55
Iron-56
Zinc-65
Zinc-66
Foreachpairabove,lookuptheelement’satomicmassfromthereferencetableanddecidewhichisotopeismoreabundant.Circlethemoreabundantisotope’sname.
Objective:• Differentiatebetweenatomicnumber,massnumber,and(average)atomicmass• Calculatethe(average)atomicmassforallisotopesofanelement• Calculatethenumberofneutronsinanisotope
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Calculatingaverageatomicmass
1. Whatisyourquartergradeifyourcategorieshavethefollowingweights?YourGrades:
Test(60%oftheaverageofalltestsscores) 60Labs(15%oftheaverageofalllabscores) 90Quiz(25%oftheaverageofallhw/cw) 95
Findtheaverageatomicmassforeachofthefollowing:(showyourwork)
2. Silver:55.0%Ag-107,45.0%Ag-109
3. Indium:40.0%In-113,60.0%In-115
4. Rhendium:30.0%Re-185,70%Re-187
5. Copper:75.0%Cu-63,25.0%Cu-65
6. Chlorine:75.5%Cl-35,therestCl-37
7. Oxygen:99.76%O-16,0.046%O-17,and0.20%O-18
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4. Baseyouranswerstothefollowingquestionsonthedatatablebelow,whichshowsthreeisotopesofneon.
a. Intermsofatomicparticles,stateonedifferencebetweenthesethreeisotopesofneon.
b. Basedontheatomicmassesandthenaturalabundancesshowninthedatatable,showacorrectnumericalsetupforcalculatingtheaverageatomicmassofneon.
c. Basedonnaturalabundances,theaverageatomicmassofneonisclosesttowhichwholenumber?
REGENTSPRACTICE
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5. TheatomicmassofelementAis63.6atomicmassunits.TheonlynaturallyoccurringisotopesofelementAareA-63andA-65.ThepercentabundancesinanaturallyoccurringsampleofelementAareclosestto(1)31%A-63and69%A-65 (2)50%A-63and50%A-65(3)69%A-63and31%A-65 (4)100%A-63and0%A-65
6. WhatisthemostabundantorcommonisotopeofVanadium(V)?
a)50V b)52V c)51V d)49V
7. A100.00-gramsampleofnaturallyoccurringboroncontains19.78gramsofboron-10(atomicmass=10.01atomicmassunits)and80.22gramsofboron-11(atomicmass=11.01atomicmassunits).Whichnumericalsetupcanbeusedtodeterminetheatomicmassofnaturallyoccurringboron?
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LESSON#6GROUNDVS.EXCITEDSTATEANDBRIGHTLINESPECTRUM
1. Completethetablebelow.Thefirstoneisdoneforyou.
Electronconfiguration
Total#ofe-‘s
Total#of
e-shells
e-shellwiththehighestenergye-‘s
Excited-orground-state
Atom’ssymbol
AtomA 2-8-4 14 3 3rd ground SiAtomB 2-3-1 AtomC 2-8-7-1 AtomD 2-8-18-6 AtomE 2-8-18-17-5 AtomF 1-7
2. Completethetablebelow.Thefirstoneisdoneforyou.
Elementsymbol
Elementname
Ground-stateelectronconfiguration
#ofvalenceelectrons
Giveanexampleofanexcited-stateelectron
configurationO oxygen 2-6 6 2-5-1Mg He K N P F Sr Al Br Cu
Objective:• Differentiatebetweenexcitedandgroundstate• Explainhowlightisproduced• Identifysubstancesbasedupontheirbrightlinespectra
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3. DrawaBohrmodelforSodiuminthegroundstate.Indicatewithanarrowwhatdirectionanelectronmoveswhenenergyisabsorbed.
4. Onthesamemodelabove,drawanarrowtoindicatewhatdirectionanelectronmoveswhenenergyisreleased.Whattypeofenergyisreleased?
5. Baseyouranswerstoquestions4and5onthediagrambelow,whichshowsbright-linespectraofselectedelements.
6. Identifythetwoelementsintheunknownspectrum._________________________________
7. Explainhowabright-linespectrumisproduced,intermsofelectronsandenergystates.
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LESSON#7LEWISDOTDIAGRAMS
Lewisdiagramsshowonlytheatom’ssymbolanddotsrepresentingthevalenceelectrons.Themostvalenceelectronsanatomcanhaveis____sothemostdotsyouwilldrawis____.Pleasemakedotsveryvisible!
Examplesofatoms:
Name Protons Neutrons ElectronsElectron
Configuration
Valence
ElectronsLewisDiagram
Rubidium-85
Barium-138
Strontium-88
Bromine-80
Oxygen-16
Nitrogen-14
Objective:• ConstructLewisdotdiagramsforatomsandions
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ExamplesofIons:
Name Protons Neutrons Electrons ElectronConfiguration
ValenceElectrons
LewisDiagram
Rb+1
Ba+2
Sr+2
Br-1
O-2
N-3
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REGENTSPRACTICE
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