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U4 Glow in the Dark Thematic Project
U4A
Part 1A: Getting the Data for your Neutral Isotope
1. Identify the following data for your assigned isotope.
 Element name, Nuclear Symbol and Hyphen Notation
 Atomic number of your isotope
 Mass number of your isotope
 Number of protons in your isotope
 Number of electrons in your isotope
 Number of neutrons in your isotope
Part 1B: Making a 2-D Model of your Isotope. (This is not a Bohr Model with rings, but a simple
electron cloud model.)
2. On the front of a piece of white paper, draw a circle with a radius of approximately 3 cm in the
center of the page. Label it the NUCLEUS! (1 point)
3. Using the same center point, draw a circle with a radius of approximately 10 cm surrounding the
smaller circle. Label the area between the smaller and larger circle the ELECTRON CLOUD! (1
point)
4. Using the data determined above & different color markers to represent protons, electrons and
neutrons, indicate the number of each kind of subatomic particle by drawing the the correct
numbers of colored circles in their correct places. Create a key to denote the color of each
subatomic particle (1.5 points)
5. Somewhere on the model, write out the information seen in part A. (6 points)
Part 1C: Calculating the Average Atomic Mass of the Element of your Isotope
1. Using the website (https://www.webelements.com/), scroll down the page until you see the
“isotopes and NMR” data link on the right to determine the number of naturally occurring
isotopes for your element. Disregard the numbers in the parentheses behind the percent and
the exact mass. of each isotope. Write down the exact mass and percent abundance for each
isotope in the format seen below. Reminder: Your element may have more than 2 isotopes and
you must change each percent into decimal form to calculate average atomic mass. (1 point)
Example for carbon:
12
C = 12.000000 amu, 98.90 %
C = 13.003355 amu, 1.10%
13
2. Calculate the average atomic mass. You must show work to receive credit. Round your answer
to 4 or 5 sig figs and circle your answer. (2 points)
Part 1D: Determining Ion Data for your Isotope
1. Determine the most common ionic charge (oxidation number) of your atom using the website
http://www.cabrillo.edu/~aromero/Common%20Files/Periodic%20Table%20%28Common%20I
onic%20Charges%29.pdf and complete the chart below. Some elements may form more than
once charge. You only need to select one of them to fill in the data below. Krypton does not
have an ionic charge because of its stability. If you were assigned krypton, you will use a +1
charge to complete this part. (3 points)
 Chemical formula of the ion
 Ion Name – go back to U2A notes (section 2.2) for a refresher
 Type of ion: Cation or Anion
 Number of protons
 Number of electrons
 Number of neutrons
Part 2: Nuclear Reactions: Your isotope is stable but let’s pretend it is radioactive.
1. Write a balanced nuclear decay reaction for the alpha decay of your assigned isotope.
2. Write a balanced nuclear decay reaction for the beta decay of your assigned isotope.
3. Assign a made–up half-life time to your isotope (could be in seconds, minutes, days, years, etc. )
and create a half-life word problem. Then show your work to solve for the answer.
Part 3: Electron Configuration
1. Write the electron configuration of your atom following the Aufbau principle learned in class.
(Even if your element has an exceptional configuration as noted on the card, follow the Aufbau
principle ONLY.
2. Draw the orbital notation of your atom.
3. Write the shorthand configuration (noble gas configuration) of your atom.
4. Draw a Lewis Dot Diagram of your atom.
5. Determine the electron configuration for the ion of your isotope that was selected in part 1D
Unit 4B
Part 4: Periodic Table Properties
1. Determine the location of your element on the periodic table by stating the period and group
number of it.
2. How many valence electrons does your element have?
3. Classify your element as a metal, nonmetal or metalloid and state 2 general properties of your
class of elements.
4. What is the family or group name of your element? State 2 properties of your family or group of
elements. These need to be different than the properties stated in number 3. These are specific
to the family, not the type of element.
5. Who was the discovered of your element and in what year was it discovered?
6. What is the purpose of your element? List 2-3 uses of your element in our society.
Part 5: Trends of the Periodic Table
1. Decide whether you will move to the right or left direction from your element. State the
direction you will go.
a. Does the atomic radius increase or decrease in the direction you have
selected. Explain the trend using the word “nuclear charge”.
b. Does the ionization energy increase or decrease in the direction you have
selected. Explain the trend using the word “nuclear charge”.
c. Does the electronegativity increase or decrease in the direction you have
selected. Explain the trend using the word “nuclear charge”.
2. Decide whether you will move up or down in the direction from your element. State the
direction you will go.
a. Does the atomic radius increase or decrease in the direction you have
selected. Explain the trend using the word “energy levels”.
b. Does the ionization energy increase or decrease in the direction you have
selected. Explain the trend using the word “energy levels”.
c. Does the electronegativity increase or decrease in the direction you have
selected. Explain the trend using the word “energy levels”.
3. Go back to part 1D, and identify the kind of ion your element formed. Cation or Anion.
Determine if your ion is larger or smaller than the neutral atom and explain why?