History, Atomic Theory, and Atoms Review Packet · · 2017-08-28History, Atomic Theory, and Atoms Review Packet HW: ... Fill in the missing information in the chart below: ... Fill

History, Atomic Theory, and Atoms Review Packet HW: Due Wednesday, November 22nd

Name ____________________________ Date _______ Period _______

Atomic Theory

Fill in the missing information in the chart below:

Name of Researcher Equipment/

Experiment

Sketch of Model Major Idea/Discovery

N/A

All atoms of a given element are identical in mass and properties

Thomson

Rutherford

N/A

Electrons travel around the

nucleus in welldefined

paths called orbits (like

planets in a solar system)

N/A

Electrons have distinct amounts of energy and move in areas called orbitals Developed after the famous discovery that energy can behave as both waves & particles

Collegiate Institute for Math and Science Ms. Khanis

Day 45: November 21, 2016 Room 427





Atomic Structure Worksheet

**Assume all are neutral atoms! Fill in the blanks in the following worksheet. Please keep in mind that the isotope represented by each space

may NOT be the most common isotope or the one closest in atomic mass to the value on the periodic table.

Atomic

symbol

Atomic

number

Protons Neutrons Electrons Mass

number

C 8

12 24

31 40

40 89

30 35

42 98

W 183

105 71

95 243

Cr 27

83 209

90 142

Md 259

Se 80

40 51

Notice there are two different atoms of zirconium (Zr) listed. These different

versions are called ISOTOPES. What one subatomic particle is different from

one isotope to the other? __________________________________



Atomic Theory- Neutral Atoms and their subatomic parts

**IMPORTANT**If the mass number is not given to you, round the atomic mass that you find on the Periodic Table for that element.

How many protons, neutrons, and electrons are present

in the following neutral atoms?

vanadium

nitrogen platinum

argon helium

What is the name of the element that has neutral atoms that contain:

5 protons? 16 electrons? _____________________ _____________________

17 protons? 32 electrons?

_____________________ _____________________

25 protons? 1 electron?

_____________________ _____________________


_____________________ _____________________


_____________________ _____________________

P = N =

e =

potassium



Complete the following chart: (assume the overall charge on all atoms = 0….except the last one!)

Element Symbol Atomic

Number

# of

Protons

# of

Neutrons

Mass

Number

(amu)

# of

Electrons

Hydrogen

1

He 4

Na 12

Potassium

39

20 20

26 30

Rb 86

Carbon

6

Xenon

131

16 15

At 126

14 7

Copper

64

Ne 10

23 27

Lithium

Ion

Li+ 3



Calculate the atomic mass of each of the following isotopes. SHOW ALL WORK.

Element Mass Percent Abundance

1) copper-63 62.9396 amu 69.17%

copper-65 64.9278 amu 30.83%

2) uranium-235 235.0439 amu 0.72%

uranium-238 238.0510 amu 99.28%

3) hydrogen-1 1.0078 amu 99.985%

hydrogen-2 2.0140 amu 0.015%

4) element Q-8 8.0 amu 10.0% element Q-9 9.0 amu 20.0% element Q-10 10.0 amu 70.0%

Weighted Averages (SHOW ALL WORK!) *You can round the masses given to you or use them as given – just be consistent!

1) Element X exists in three isotopic forms. The isotopic mixture consists of 10.0% 10X,

20.0% 11X, and 70.0% 12X. What is the average atomic mass of this element?



2) Element Y exists in three isotopic forms. The Isotopic mixture consists of 15.0% 21X,

65.0% 22X, and 20.0% 23X. That is the average atomic mass of this element?

3) A mystery element occurs in nature as two isotopes. Isotope A has a mass of 10.0130 amu and its

abundance is 19.9%; Isotope B has a mass of 11.0093 amu and its abundance is 80.1%. From this

data, calculate the atomic mass of the element and show all work. Lastly, identify the element.

4) A mystery element occurs in nature as two isotopes. Isotope A has a mass of

62.939598 amu and its abundance is 69.17%; Isotope B has a mass of 64.927793 amu and its

abundance is 30.83%. From this data, calculate the atomic mass of the element and show all work.

Lastly, identify the element.

5) A mystery element occurs in nature as three isotopes. Isotope A has a mass of

15.994915 amu and its abundance is 99.762%; Isotope B has a mass of 16.999132 amu and its

abundance is 0.0380%; Isotope C has a mass of 17.999160 amu and its abundance is 0.2000%.

From this data, calculate the atomic mass of the element and show all work. Lastly, identify the

element.

Isotopes and Average Atomic Mass Example: A sample of cesium is 75% 133Cs, 20% 132Cs, and 5% 134Cs. What is the average

atomic mass?



Determine the average atomic mass of the following mixtures of isotopes.

1. 80% 127I, 17% 126I, 3% 128I

2. 50% 197Au, 50% 198Au

3. 15% 55Fe, 85% 56Fe

4. 99% 1H, 0.8% 2H, 0.2% 3H

5. 95% 14N, 3% 15N, 2% 16N



Construct Bohr diagrams for the following:

Na electron configuration ___________

F electron configuration ___________

O

electron configuration ___________

Li+ electron configuration ___________

Cl-

electron configuration ___________

Ne electron configuration ___________





Draw Lewis Dot Diagrams for the following:

Bohr and Lewis Dot Diagrams

Element Electron Configuration Bohr Diagram

Carbon

p = n = e =

Oxygen

p = n = e =

Sodium

p = n = e =

Neon

p = n = e =

13. Give the ground state electron configuration for calcium. _____________________

14. How many principal (orbital levels) energy levels are there in a iron atom? ________

Documents

History, Atomic Theory, and Atoms Review Packet · · 2017-08-28History, Atomic Theory, and Atoms Review Packet HW: ... Fill in the missing information in the chart below: ... Fill