atomic structure worksheets

8/10/2019 Atomic Structure Worksheets

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Surviving Chemistry

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Atomic Structure


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Copyright 2010 E3 Scholastic Publishing All Right Reserved.

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Atomic Structure Worksheets

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18 From Surviving Chemistry: Workbook e3chemistry.com

Worksheet 9: The Atomic Structures Topic 3

Set A: Terms and definitions Objective: 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. Nucleus

2. Neutron

3. Proton

4. Electron

5. Nucleons

6. Atomic number

7. Mass number

8. Atomic mass

9. Isotopes

10. Atomic mass unit

Set B: The Subatomic Particles Objective: To test your knowledge of facts related to thethree subatomic particles

Complete the table below

11.

12.

13.

Subatomic particles Symbol Mass Charge Location

Proton

Electron

Neutron


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Copyright2010 E3 Scholastic Publishing. All Rights Reserved. e3chemistry.com 19

Worksheet 9 Topic 3

Set C: Determining number of atomic particles Objective: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 MassNumber Atomicnumber Nuclearcharge Nucleons Elementssymbol

Atom A 44 102

Atom B 84 125

Atom C 56 Mn

Atom D 89 229

Atom E 30 +28

Atom F 92 233

Atom G 82 Ba

Set D: Isotope symbols Objective:To test your ability to relate isotope symbol to numberof particles in an atom

15. Complete the table below based on information provided for each atom/ All the atoms are neutral.

Isotopesymbol Protons electrons neutrons Massnumber Atomicnumber Nuclearcharge Nucleons NucleusDiagram

Atom H 142 Pr59

Atom I 31 +27

Atom J 243 Am95

Atom K 77 194

Atom L 80 Se

Atom M22 p26 n


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Need help? Study Book pg 38 40 Set 12 - 17

Worksheet 10: Atomic Mass Topic 3

Set A: Calculating atomic mass Objective:To test your ability to calculate atomic mass of an elementfrom relative abundance and mass numbers of its isotopes

Calculate the atomic mass for each element given the relative percentages and the mass numbers ofthe isotopes. Show ALL set up and work.

1) 19.78 % of 10B

80.22% of11

B

2) 93.12 % of39

K

6.88 % of41

K

3) 78.70 % of24

Mg

10.13 % of25

Mg

11.17 % of26

Mg

4) 80.0% of70

X

12.25% of69

X

7.75% of68

X

5) A sample of chlorine contains 75% of chlorine-35 and 25% of chlorine-37. What is the atomic mass of

chlorine? show work.

6) Element X has two naturally occurring isotopes. If 72% of the atoms have a mass of 85 amu

and 28% of the atoms have a mass of 87 amu, what is the atomic mass of element X. Show work.

7) The atomic mass of an element is dependent upon what two factors?


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Worksheet 11: Bohrs atomic model and electron configuration Topic 3

Set A: Drawing Bohrs atomic model Objective: To test your ability to obtain information fromelectron configuration, and to draw Bohrs atomic model.

Based on information from the Periodic Table, answer questions in each box about the given element.

Then draw Bohrs atomic model for the element.

1. Magnesium - 25

Electron configuration:

Number of electron shells: ____

Valance shell: : ____

Number of valance electrons: ____

Draw Bohrs atomic model for magnesium-25.Indicate appropriate number of particles in thenucleus, and electrons (-) in electron shells.

2. Neon - 21





Draw Bohrs atomic model for neon-21.Indicate appropriate number of particles in thenucleus, and electrons (-) in electron shells.

3. Rubidium - 86





Draw Bohrs atomic model for rubidium-86.Indicate appropriate number of particles in thenucleus, and electrons (-) in electron shells.

4. Selenium - 78





Draw Bohrs atomic model for selenium-78.Indicate appropriate number of particles in thenucleus, and electrons (-) in electron shells.


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Worksheet 11 Topic 3

Set B: Electron configurations Objective: To test your ability to interpret electron configuration Excited and Ground States

Electron configurations for six atoms are given. Complete information about each neutral atom on thetable .

5.

6.

7.

8.

9.

10.

Electronconfiguration

Total numberof electrons

Totalnumber ofelectronshells

Electronshell withthe highestenergyelectrons

Excited orgroundstate

Atomssymbol

Atom A 2 8 4

Atom B 2 3 1

Atom C 2 8 7 1

Atom D 2 8 18 6

Atom E 2 8 18 17 5

Atom F 1- 7

Below, 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: 3rd

shell ----------------- > 2nd

shell Atom I: 4th

shell-------------------- > 6th

shell

Atom H: 1st

shell --------------- > 4th

shell Atom J: 5th

shell ------------------ > 3rd

shell

Set C: Electron transition Objective:To test your ability to interpret electron transition in atoms

11. 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 3rd

shell to that of the electron in the 2nd

shell.


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Set D: Bright-line spectra Objective:To test your ability to analyze bright-line spectra chart

Below, 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.

17. 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.

7500 7000 6500 6000 5500 5000 4500 4000wavelength: A (10

-10m)

Lithium (Li)

Sodium (Na)

Helium (He)

Potassium(K)

Cadmium(Cd)

Hydrogen (H)

Unknown W

Unknown X

Unknown Y

Unknown Z


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Worksheet 12 : Neutral atoms and ions Topic 3

Set A: Terms and definitions Objective: By defining these words , youll 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 atom

2. Ion

3. Positive ion

4. Negative ion

5. Valance electron

Set B: Comparisons in ions and neutral atoms Objective: To test your knowledge of facts relatedof ions and neutral atoms

Answer the followings in one clear sentence.

6. 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.


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Set 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 given

Atom and Ionsymbols

Atomicnumber

Number ofprotons

Number ofelectrons

Number ofneutrons

Electron configuration

C

C4-

Sr

Sr2+

27Al

27Al

3+

31P

31

P

-3

13.

14.

15.

16.

17.

18.

19.

20.

Set D: Determining charge of atom. Objective:To test your ability to determine charge ofatoms based on the number o subatomic articles

Determine the charge of each atom based on information given.

21. 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 =


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Answers


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Copyright2011 E3 Scholastic Publishing. All Rights Reserved. 17

Worksheet 8: Historical development of atoms Topic 3: The atomic structure

Set A: Historical atomic models Objective: To test your knowledge of historical atomic models

Draw and briefly describe each historical model of the atom.

1. Hard sphere model

2. Plum-pudding model

3. Empty space model

4. Bohrs model

5. Wave mechanical model

6. State two conclusions of the Gold foil experiment.

.Atom is mostly empty space

.The center of the atom is dense, small, and positively charged

7. 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 atom


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18 Copyright 2011 E3 Scholastic Publishing. All Rights Reserved.

Worksheet 9: The Atomic Structures Topic 3

Set A: Terms and definitions Objective: 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. Nucleus

2. Neutron

3. Proton

4. Electron

5. Nucleons

6. Atomic number

7. Mass number

8. Atomic mass

9. Isotopes

10. Atomic mass unit

Set B: The Subatomic Particles Objective: To test your knowledge of facts related to thethree subatomic particles

Complete the table below

11.

12.

13.

Subatomic particles Symbol Mass Charge Location

Proton

p 1 +1 Nucleus

Electron e 0 -1 Orbital (outside

nucleus)

Neutron n 1 0 nucleus

1

+1

0

-1

10


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Worksheet 9 Topic 3

Set C: Determining number of atomic particles Objective: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 MassNumber Atomicnumber Nuclearcharge Nucleons Elementssymbol

Atom A 44 44 58 102 44 +44 102 Ru

Atom B 84 84 125 209 84 +84 209 Po

Atom C 25 25 31 56 25 +25 56 Mn

Atom D 89 89 140 229 89 +89 229 Ac

Atom E 28 28 30 58 28 +28 58 Ni

Atom F 92 92 141 233 92 +92 233 U

Atom G 56 56 82 138 56 +56 138 Ba

Set D: Isotope symbols Objective:To test your ability to relate isotope symbol to numberof particles in an atom

15. Complete the table below based on information provided for each atom/ All the atoms are neutral.

Isotopesymbol Protons electrons neutrons Massnumber Atomicnumber Nuclearcharge Nucleons NucleusDiagram

Atom H 142 Pr59

59 59 83 142 59 +59 142

Atom I Ce 27 27 31 58 27 +27 58

Atom J 243 Am95

95 95 148 243 95 +95 243

Atom K Ir 77 77 117 194 77 +77 194

Atom L 80 Se 34 34 46 80 34 +34 80

Atom M V 22 22 26 48 22 +22 4822 p26 n

59 p83 n

58

2727 p31 n

95 p148 n

77 p117 n

34 p46 n

194

77

48

22


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Need help? Study Book pg 38 40 Set 12 - 17

Worksheet 10: Atomic Mass Topic 3

Set A: Calculating atomic mass Objective: To test your ability to calculate atomic mass of an elementfrom relative abundance and mass numbers of its isotopes

Calculate the atomic mass for each element given the relative percentages and the mass numbers ofthe isotopes. Show ALL set up and work.

1) 19.78 % of 10B .1978 x 10 = 1.978

+ =

80.22% of11

B .8022 x 11 = 8.8242

2) 93.12 % of39

K .9312 x 39 = 36.3168

+ =

6.88 % of41

K .0688 x 41 = 2.8208

3) 78.70 % of24

Mg .7870 x 24 = 18.888

+

10.13 % of25

Mg .1013 x 25 = 2.5325 =

+

11.17 % of26

Mg .1117 x 26 = 2.9042

4) 80.0% of70

X .800 x 70 = 56.000

+

12.25% of69

X .1225 x 69 = 8.4525 =+

7.75% of 68X .0775 x 68 = 5.270

5) A sample of chlorine contains 75% of chlorine-35 and 25% of chlorine-37. What is the atomic mass of

chlorine? show work.

75% of Cl-35 .75 x 35 = 26.25

+ =

25% 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 = 61.2

+ =

28% of X-87 .28 x 87 = 24.37

7) The atomic mass of an element is dependent upon what two factors?

Mass numbers and percent abundances of all naturally occurring isotopes

10.8022 amu

39.1376 amu

24.3247 amu

69.7225 amu

35.5 amu

85.56 amu


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Worksheet 11: Bohrs atomic model and electron configuration Topic 3

Set A: Drawing Bohrs atomic model Objective: To test your ability to obtain information fromelectron configuration, and to draw Bohrs atomic model.

Based on information from the Periodic Table, answer questions in each box about the given element.

Then draw Bohrs atomic model for the element.

1. Magnesium - 25





Draw Bohrs atomic model for magnesium-25.Indicate appropriate number of particles in the

nucleus, and electrons (-) in electron shells.

2. Neon - 21





Draw Bohrs atomic model for neon-21.Indicate appropriate number of particles in thenucleus, and electrons (-) in electron shells.

3. Rubidium - 86





Draw Bohrs atomic model for rubidium-86.Indicate appropriate number of particles in thenucleus, and electrons (-) in electron shells.

4. Selenium - 78




Number of valance electrons:____

Draw Bohrs atomic model for selenium-78.Indicate appropriate number of particles in thenucleus, and electrons (-) in electron shells.

3

3rd

2

2

2nd

8

5

5th

1

4

4th

6 .

12 p13 n 10 p

11 n

37 p49 n

34 p44 n

2 e-

8e-

2e-

8e-

2e-

1e-

8e-

18e-

8e-

1e-

6e-

18e-

8e-

2e-


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Set B: Electron configurations Objective: To test your ability to interpret electron configuration Excited and Ground States

Electron configurations for six atoms are given. Complete information about each neutral atom on thetable .

5.

6.

7.

8.

9.

10.

Electronconfiguration

Total numberof electrons

Totalnumber ofelectronshells

Electronshell withthe highestenergyelectrons

Excited orgroundstate

Atomssymbol

Atom A 2 8 4 14 3 3r Ground Si

Atom B 2 3 1 6 3 3r Excited C

Atom C 2 8 7 1 18 4 4 Excited Ar

Atom D 2 8 18 634 4 4 Ground Se

Atom E 2 8 18 17 5 50 5 5 Excited Sn

Atom F 1- 7 8 2 2n

Excited O

Below, 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: 3rd

shell ----------------- > 2nd

shell Atom I: 4th

shell-------------------- > 6th

shell

Atom H: 1st

shell --------------- > 4th

shell Atom J: 5th

shell ------------------ > 3rd

shell

Set C: Electron transition Objective:To test your ability to interpret electron transition in atoms

11. In which atom or atoms are energy absorbed during the electron transition? Atom H and Atom I

12. In which atom or atoms are energy released during the electron transition? Atom G and Atom J

13. In which atom or atoms are spectral lines observed? Atom G and Atom J

14. In which atom is the greatest amount of energy absorbed? Atom H

15. In which atom is the greatest amount of energy released? Atom J

16. In atom G, compare the energy of the electron in the 3rdshell to that of the electron in the 2ndshell.

Energy of electron in the 3rd

shell is greater than energy of the electron in the 2nd

shell


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Set D: Bright-line spectra Objective:To test your ability to analyze bright-line spectra chart

Below, 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.

17. 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 to

Low (ground ) state.

7500 7000 6500 6000 5500 5000 4500 4000wavelength: A (10

-10m)

Lithium (Li)

Sodium (Na)

Helium (He)

Potassium(K)

Cadmium(Cd)

Hydrogen (H)

Unknown W

Unknown X

Unknown Y

Unknown Z


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Worksheet 12 : Neutral atoms and ions Topic 3

Set A: Terms and definitions Objective: By defining these words , youll 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 atom

2. Ion

3. Positive ion

4. Negative ion

5. Valance electron

Set B: Comparisons in ions and neutral atoms Objective: To test your knowledge of facts relatedof ions and neutral atoms

Answer the followings in one clear sentence.

6. Compare the number of electrons to the number of protons in a neutral atom. They are EQUAL

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. A positive ion has FEWER electrons than the neutral atom

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. A negative ion has MORE electrons the neutral atom

9. 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 electrons

10. 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 electrons

11. 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 atom

12. 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 atom


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Set 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 given

Atom and Ionsymbols

Atomicnumber

Number ofprotons

Number ofelectrons

Number ofneutrons

Electron configuration

C6 6 6 2 4

C4-

6 6 8 2 8

Sr38 38 38 2 8 18 8 2

Sr2+

38 38 36 2 8 18 8

27Al

13 13 13 14 2 8 3

27Al

3+

13 13 10 14 2 8

31P

15 15 15 16 2 8 5

31

P

-3 15 15 18 16 2 8 8

13.

14.

15.

16.

17.

18.

19.

20.

Set D: Determining charge of atom. Objective: To test your ability to determine charge ofatoms based on the number o subatomic articles

Determine the charge of each atom based on information given.

21. 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 =

+4

+2

-4

-3

+2

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