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Atomic Structure Worksheets

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.<strong>Atomic</strong> <strong>Structure</strong> <strong>Worksheets</strong>One Concept at a Time<strong>Worksheets</strong> for High School Chemistry from our“Workbook”excite engage enhanceEffiong EyoE3 Scholastic PublishingSurviving Chemistry Book SeriesFamily of student-friendly HS chemistry books that are certain to:Excite students to studyEngage students in learningEnhance students understandingFor more information and to order:e3chemistry.com (877) 224 – 0484info@e3chemistry.comCopyright © 2010 E3 Scholastic Publishing All Right Reserved.


Worksheet 8: Historical development of atoms.Topic 3: The atomic structureSet A: Historical atomic modelsObjective: To test your knowledge of historical atomic modelsDraw and briefly describe each historical model of the atom.1. Hard sphere model2. Plum-pudding model3. Empty space model4. Bohr’s model5. Wave mechanical model6. State two conclusions of the Gold foil experiment.7. State conclusions of the Cathode ray experiment.Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. e3chemistry.com 17


Worksheet 9: The <strong>Atomic</strong> <strong>Structure</strong>s Topic 3.Set A: Terms and definitionsObjective: By defining these words, you will become more familiar withatomic structure related terms and their definitions.Define, neatly and clearly, the following atomic structure related terms.1. Nucleus2. Neutron3. Proton4. Electron5. Nucleons6. <strong>Atomic</strong> number7. Mass number8. <strong>Atomic</strong> mass9. Isotopes10. <strong>Atomic</strong> mass unitSet B: The Subatomic ParticlesObjective: To test your knowledge of facts related to thethree subatomic particlesComplete the table belowSubatomic particles Symbol Mass Charge Location11.Proton12.Electron13.Neutron18 From “Surviving Chemistry: Workbook” e3chemistry.com


Worksheet 9 Topic 3.Set C: Determining number of atomic particlesObjective: To test your ability to determine numberof particles in an atom .14. Complete the table below based on information provided for each atom. All the atoms are neutral.Protons electrons Neutrons MassNumberAtom A 44 102<strong>Atomic</strong>numberNuclearchargeNucleonsElement’ssymbolAtom B 84 125Atom C 56 MnAtom D 89 229Atom E 30 +28Atom F 92 233Atom G 82 BaSet D: Isotope symbolsObjective: To test your ability to relate isotope symbol to numberof particles in an atom15. Complete the table below based on information provided for each atom/ All the atoms are neutral.IsotopesymbolProtons electrons neutrons Massnumber<strong>Atomic</strong>numberNuclearchargeNucleonsNucleusDiagramAtom H142Pr59Atom I 31 +27Atom J243Am95Atom K 77 194Atom L80SeAtom M22 p26 nCopyright©2010 E3 Scholastic Publishing. All Rights Reserved. e3chemistry.com 19


Worksheet 11: Bohr’s atomic model and electron configuration Topic 3Set A: Drawing Bohr’s atomic modelObjective: To test your ability to obtain information fromelectron configuration, and to draw Bohr’s atomic model.Based on information from the Periodic Table, answer questions in each box about the given element.Then draw Bohr’s atomic model for the element..1. Magnesium - 25Electron configuration:Number of electron shells: ____Valance shell: : ____Number of valance electrons: ____Draw Bohr’s atomic model for magnesium-25.Indicate appropriate number of particles in thenucleus, and electrons (-) in electron shells.2. Neon - 21Electron configuration:Number of electron shells: ____Valance shell: : ____Number of valance electrons: ____Draw Bohr’s atomic model for neon-21.Indicate appropriate number of particles in thenucleus, and electrons (-) in electron shells.3. Rubidium - 86Electron configuration:Number of electron shells: ____Valance shell: : ____Number of valance electrons: ____Draw Bohr’s atomic model for rubidium-86.Indicate appropriate number of particles in thenucleus, and electrons (-) in electron shells.4. Selenium - 78Electron configuration:Number of electron shells: ____Valance shell: : ____Number of valance electrons: ____Draw Bohr’s atomic model for selenium-78.Indicate appropriate number of particles in thenucleus, and electrons (-) in electron shells.Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. e3chemistry.com 21


Worksheet 11 Topic 3.Set B: Electron configurationsExcited and Ground StatesObjective: To test your ability to interpret electron configurationElectron configurations for six atoms are given. Complete information about each neutral atom on thetable .5.ElectronconfigurationAtom A 2 – 8 – 4Total numberof electronsTotalnumber ofelectronshellsElectronshell withthe highestenergyelectronsExcited orgroundstateAtom’ssymbol6.Atom B 2 – 3 – 17.Atom C 2 – 8 – 7 – 18.Atom D 2 – 8 – 18 – 69.Atom E 2 – 8 – 18 – 17 – 510.Atom F 1- 7Set C: Electron transitionObjective: To test your ability to interpret electron transition in atomsBelow, electron transitions from one electron shell to another are given for four different atoms.Answer questions 11 - 16 based on the electron transition in these atoms.Atom G: 3 rd shell ----------------- > 2 nd shell Atom I: 4 th shell-------------------- > 6 th shellAtom H: 1 st shell --------------- > 4 th shell Atom J: 5 th shell ------------------ > 3 rd shell11. In which atom or atoms are energy absorbed during the electron transition?12. In which atom or atoms are energy released during the electron transition?13. In which atom or atoms are spectral lines observed?14. In which atom is the greatest amount of energy absorbed?15. In which atom is the greatest amount of energy released?16. In atom G, compare the energy of the electron in the 3 rd shell to that of the electron in the 2 nd shell.22 From “Surviving Chemistry: Workbook” e3chemistry.com


Worksheet 11 Topic 3.Set D: Bright-line spectraObjective: To test your ability to analyze bright-line spectra chartBelow, bright-line spectral chart for five elements and four unknown samples are given.Answer questions 17 - 21 based on the information given in the chart.7500 7000 6500 6000 5500 5000 4500 4000wavelength: A (10 -10 m)Lithium (Li)Sodium (Na)Helium (He)Potassium(K)Cadmium(Cd)Hydrogen (H)Unknown WUnknown XUnknown YUnknown Z17. List all elements present in unknown sample W .18. List all elements present in unknown sample X .19. List all elements present in unknown sample Y.20. List all elements present in unknown sample Z.21. Explain, in terms of electron transition, how bright-line spectra are produced by atoms.Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. e3chemistry.com 23


Worksheet 12 : Neutral atoms and ions Topic 3.Set A: Terms and definitionsObjective: By defining these words , you’ll become more familiarwith terms and definitions related to ions and neutral atoms.Define the terms and answer questions below. Be neat and clear.1. Neutral atom2. Ion3. Positive ion4. Negative ion5. Valance electronSet B: Comparisons in ions and neutral atomsAnswer the followings in one clear sentence.Objective: To test your knowledge of facts relatedof ions and neutral atoms6. Compare the number of electrons to the number of protons in a neutral atom.7. Compare the number of electrons of a positive ion to that of the neutral atom.Include both positive ion and neutral atom in your answer.8. Compare the number of electrons of a negative ion to that of the neutral atom.Include both negative ion and neutral atom in your answer.9. Compare the number of protons to the number of electrons in a positive ion.Include both protons and electrons in your answer.10. Compare the number of protons to the number of electrons in a negative ion.Include both protons and electrons in your answer.11. Compare the size of a positive ion to that of the neutral atom.Include both positive ion and neutral atom in your answer.12. Compare the size of a negative ion to that of the neutral atom.Include both negative ion and neutral atom in your answer.24 From “Surviving Chemistry: Workbook” e3chemistry.com


Worksheet 12 Topic 3.Set C: Particles in atoms and ionsObjective: To test your ability to determine informationfrom atomic and ionic symbols.Below, symbol of an atom or ion is given. Complete the table below based on the symbol givenAtom and Ionsymbols<strong>Atomic</strong>numberNumber ofprotonsNumber ofelectronsNumber ofneutronsElectron configuration13.14.15.16.CC 4-SrSr 2+17.27 Al18.27 Al 3+19.31 P20.31 P -3Set D: Determining charge of atom.Determine the charge of each atom based on information given.Objective: To test your ability to determine charge ofatoms based on the number of subatomic particles21. Atom A: 46 protons, 61 neutrons, 42 electrons. Charge =22. Atom B: mass number of 209, nuclear charge of 83, and 81 electrons: Charge =23. Atoms C: nuclear charge of 32, 36 electrons , 39 neutron Charge =24. Atoms D: 54 electrons, 122 nucleons, atomic number 51 Charge =25. Atom E: 28 neutrons, nuclear charge of 22, 20 electrons Charge =Copyright©2010 E3 Scholastic Publishing. All Rights Reserved. e3chemistry.com 25


Answers


Worksheet 8: Historical development of atoms.Topic 3: The atomic structureSet A: Historical atomic modelsObjective: To test your knowledge of historical atomic modelsDraw and briefly describe each historical model of the atom.1. Hard sphere model2. Plum-pudding model3. Empty space model4. Bohr’s model5. Wave mechanical model6. State two conclusions of the Gold foil experiment.. Atom is mostly empty space.The center of the atom is dense, small, and positively charged7. State conclusions of the Cathode ray experiment.. One of the particles in atoms is negatively charge. Negative and positive charged particles are disperses through the atomCopyright©2011 E3 Scholastic Publishing. All Rights Reserved. 17


Worksheet 9: The <strong>Atomic</strong> <strong>Structure</strong>s Topic 3.Set A: Terms and definitionsObjective: By defining these words, you will become more familiar withatomic structure related terms and their definitions.Define, neatly and clearly, the following atomic structure related terms.1. Nucleus2. Neutron3. Proton4. Electron5. Nucleons6. <strong>Atomic</strong> number7. Mass number8. <strong>Atomic</strong> mass9. Isotopes10. <strong>Atomic</strong> mass unitSet B: The Subatomic ParticlesObjective: To test your knowledge of facts related to thethree subatomic particlesComplete the table belowSubatomic particles Symbol Mass Charge Location11.1Proton p 1 +1 Nucleus+112.0Electron e 0 -1 Orbital (outside-1nucleus)13.Neutron 1 n 1 0 nucleus018 Copyright © 2011 E3 Scholastic Publishing. All Rights Reserved.


Worksheet 10: <strong>Atomic</strong> Mass Topic 3.Set A: Calculating atomic massObjective: To test your ability to calculate atomic mass of an elementfrom relative abundance and mass numbers of its isotopesCalculate the atomic mass for each element given the relative percentages and the mass numbers ofthe isotopes. Show ALL set up and work.Need help? Study Book pg 38 – 40 Set 12 - 171) 19.78 % of 10 B .1978 x 10 = 1.978+ =80.22% of11 B .8022 x 11 = 8.824210.8022 amu2) 93.12 % of39 K .9312 x 39 = 36.3168+ =6.88 % of 41 K .0688 x 41 = 2.820839.1376 amu3) 78.70 % of 24 Mg .7870 x 24 = 18.888+10.13 % of 25 Mg .1013 x 25 = 2.5325 =+11.17 % of26 Mg .1117 x 26 = 2.904224.3247 amu4) 80.0% of70 X .800 x 70 = 56.000+12.25% of 69 X .1225 x 69 = 8.4525 =+7.75% of68 X .0775 x 68 = 5.27069.7225 amu5) A sample of chlorine contains 75% of chlorine-35 and 25% of chlorine-37. What is the atomic mass ofchlorine? show work.75% of Cl-35 .75 x 35 = 26.2525% of Cl-37 .25 x 37 = 9.25+ =6) Element X has two naturally occurring isotopes. If 72% of the atoms have a mass of 85 amuand 28% of the atoms have a mass of 87 amu, what is the atomic mass of element X. Show work.72% of X-85 .72 x 85 = 61.228% of X-87 .28 x 87 = 24.37+ =7) The atomic mass of an element is dependent upon what two factors?Mass numbers and35.5 amu85.56 amupercent abundances of all naturally occurring isotopes20 Copyright © 2011 E3 Scholastic Publishing. All Rights Reserved.


Worksheet 11: Bohr’s atomic model and electron configuration Topic 3Set A: Drawing Bohr’s atomic modelObjective: To test your ability to obtain information fromelectron configuration, and to draw Bohr’s atomic model.Based on information from the Periodic Table, answer questions in each box about the given element.Then draw Bohr’s atomic model for the element..1. Magnesium - 25Electron configuration:Number of electron shells: ____ 3Valance shell: : ____ 3 rdNumber of valance electrons: ____ 2Draw Bohr’s atomic model for magnesium-25.Indicate appropriate number of particles in thenucleus, and electrons (-) in electron shells.2. Neon - 21Electron configuration:Number of electron shells: ____ 2Valance shell: : ____ 2 ndNumber of valance electrons: ____ 8Draw Bohr’s atomic model for neon-21.Indicate appropriate number of particles in thenucleus, and electrons (-) in electron shells.2 e-8e-8e-2e-2e-12 p13 n 10 p11 n3. Rubidium - 86Electron configuration:Number of electron shells: ____ 5Valance shell: : ____ 5 thNumber of valance electrons: ____ 1Draw Bohr’s atomic model for rubidium-86.Indicate appropriate number of particles in thenucleus, and electrons (-) in electron shells.4. Selenium - 78Electron configuration:Number of electron shells: ____ 4Valance shell: : ____ 4 thNumber of valance electrons:____ 6 .Draw Bohr’s atomic model for selenium-78.Indicate appropriate number of particles in thenucleus, and electrons (-) in electron shells.1e-8e-18e-8e-1e-37 p49 n6e-18e-8e-2e-34 p44 nCopyright©2011 E3 Scholastic Publishing. All Rights Reserved. 21


Worksheet 11 Topic 3.Set B: Electron configurationsExcited and Ground StatesObjective: To test your ability to interpret electron configurationElectron configurations for six atoms are given. Complete information about each neutral atom on thetable .5.6.7.8.9.10.ElectronconfigurationTotal numberof electronsTotalnumber ofelectronshellsElectronshell withthe highestenergyelectronsExcited orgroundstateAtom A 2 – 8 – 4 14 3 3 rd Ground SiAtom B 2 – 3 – 1 6 3 3 rd Excited CAtom’ssymbolAtom C 2 – 8 – 7 – 1 18 4 4 th Excited ArAtom D 2 – 8 – 18 – 6 34 4 4 th Ground SeAtom E 2 – 8 – 18 – 17 – 5 50 5 5 th Excited SnAtom F 1- 7 8 2 2 nd Excited OSet C: Electron transitionObjective: To test your ability to interpret electron transition in atomsBelow, electron transitions from one electron shell to another are given for four different atoms.Answer questions 11 - 16 based on the electron transition in these atoms.Atom G: 3 rd shell ----------------- > 2 nd shell Atom I: 4 th shell-------------------- > 6 th shellAtom H: 1 st shell --------------- > 4 th shell Atom J: 5 th shell ------------------ > 3 rd shell11. In which atom or atoms are energy absorbed during the electron transition? Atom H and Atom I12. In which atom or atoms are energy released during the electron transition? Atom G and Atom J13. In which atom or atoms are spectral lines observed? Atom G and Atom J14. In which atom is the greatest amount of energy absorbed? Atom H15. In which atom is the greatest amount of energy released? Atom J16. In atom G, compare the energy of the electron in the 3 rd shell to that of the electron in the 2 nd shell.Energy of electron in the 3 rd shell is greater than energy of the electron in the 2 nd shell22 Copyright © 2011 E3 Scholastic Publishing. All Rights Reserved.


Worksheet 11 Topic 3.Set D: Bright-line spectraObjective: To test your ability to analyze bright-line spectra chartBelow, bright-line spectral chart for five elements and four unknown samples are given.Answer questions 17 - 21 based on the information given in the chart.7500 7000 6500 6000 5500 5000 4500 4000wavelength: A (10 -10 m)Lithium (Li)Sodium (Na)Helium (He)Potassium(K)Cadmium(Cd)Hydrogen (H)Unknown WUnknown XUnknown YUnknown Z17. List all elements present in unknown sample W . Cadmium (Cd) and Sodium (Na)18. List all elements present in unknown sample X . Potassium (K) and Lithium (Li)19. List all elements present in unknown sample Y. Helium (He) and Lithium (Li)20. List all elements present in unknown sample Z. Helium (He), Hydrogen (H) and Sodium (Na)21. Explain, in terms of electron transition, how bright-line spectra are produced by atoms.Bright-line spectra are produced by electrons going from high (excited) state toLow (ground ) state.Copyright©2011 E3 Scholastic Publishing. All Rights Reserved. 23


Worksheet 12 : Neutral atoms and ions Topic 3.Set A: Terms and definitionsObjective: By defining these words , you’ll become more familiarwith terms and definitions related to ions and neutral atoms.Define the terms and answer questions below. Be neat and clear.1. Neutral atom2. Ion3. Positive ion4. Negative ion5. Valance electronSet B: Comparisons in ions and neutral atomsAnswer the followings in one clear sentence.Objective: To test your knowledge of facts relatedof ions and neutral atoms6. Compare the number of electrons to the number of protons in a neutral atom. They are EQUAL7. Compare the number of electrons of a positive ion to that of the neutral atom. Include both positiveion and neutral atom in your answer. A positive ion has FEWER electrons than the neutral atom8. Compare the number of electrons of a negative ion to that of the neutral atom. Include both negativeion and neutral atom in your answer. A negative ion has MORE electrons the neutral atom9. Compare number of protons to the number of electrons in a positive ion. Include both protons andelectrons in your answer. A positive ion has MORE protons than electrons10. Compare number of protons to the number of electrons in a negative ion. Include both protons andelectrons in your answer. A negative ion has FEWER protons than electrons11. Compare the size of a positive ion to that of the neutral atom. Include both positive ion and neutralatom in your answer. A positive ion is generally SMALLER than the neutral atom12. Compare the size of a negative ion to that of the neutral atom. Include both negative ion and neutralatom in your answer. A negative ion is generally BIGGER than the neutral atom24 Copyright © 2011 E3 Scholastic Publishing. All Rights Reserved.


Worksheet 12 Topic 3Set C: Particles in atoms and ions Objective: To test your ability to determine informationfrom atomic and ionic symbols.Below, symbol of an atom or ion is given. Complete the table below based on the symbol givenAtom and Ionsymbols<strong>Atomic</strong>numberNumber ofprotons.Number ofelectronsNumber ofneutronsElectron configuration13.14.C6 6 6 2 – 4C 4- 6 6 8 2 – 815.Sr38 38 38 2 – 8 – 18 – 8 – 216.2+ 38 38 36 2 – 8 – 18 – 8Sr17.27 Al13 13 13 14 2 – 8 – 318.27 3+ 13 13 10 14 2 – 8Al19.31 P15 15 15 16 2 – 8 – 520.31 -3 15 15 18 16 2 – 8 – 8PSet D: Determining charge of atom.Determine the charge of each atom based on information given.Objective: To test your ability to determine charge ofatoms based on the number of subatomic particles21. Atom A: 46 protons, 61 neutrons, 42 electrons. Charge =+422. Atom B: mass number of 209, nuclear charge of 83, and 81 electrons: Charge =+223. Atoms C: nuclear charge of 32, 36 electrons , 39 neutron Charge =-424. Atoms D: 54 electrons, 122 nucleons, atomic number 51 Charge =-325. Atom E: 28 neutrons, nuclear charge of 22, 20 electrons Charge =+2Copyright©2011 E3 Scholastic Publishing. All Rights Reserved. 25

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