Graphing Periodic Trends
The Periodic Table is arranged according to Periodic Law. The Periodic Law states that when elements
are arranged in order of increasing atomic number, their physical and chemical properties show a
periodic pattern. These patterns can be discovered by examining the changes in properties of elements
on the Periodic Table. The properties that will be examined in this lesson are: atomic size, ionic radius,
electronegativity, and ionization energy.
Procedure
 Graph 1: Atomic Radius
o For elements 1-36 make a graph of atomic radius as a function of atomic number. Plot atomic
number on the X-axis and the atomic radius on the Y-axis.

Graph 2: Ionization Energy
o For elements 1-36, make a graph of the ionization energy. Plot atomic number on the X-axis
and ionization energy on the Y-axis.

Graph 3: Electronegativity
o For elements 1-36, make a graph of the electronegativity. Plot atomic number on the X-axis and
the electronegativity on the Y-axis.

Graph 4: Ionic Radius
o For elements 1-36, make a graph of the ionic radius. Plot atomic number on the X-axis
and the ionic size on the Y-axis.
Computer Directions
1. Log into Classlink
2. Go to Google Classroom and click on the work due for today.
3. Download the word document Periodic Trends
4. Open Excel and create a new spreadsheet.
5. Copy the atomic # cell from the Word document to the Excel spread sheet (column A). Each graph
will have atomic # in the first column.
6. Copy the Atomic Radius cell from the Word document to the Excel spread sheet (column B).
7. Highlight both columns (A&B) and click on Insert at the top of the page.
8. Click on the arrow under charts and then hit OK. Make sure you have chosen the line graph.
9. Copy the graph and paste it on a new Word document.
10. Repeat steps 6-9 with a different trend. There should be 4 graphs in all.
11. Once all 4 graphs are copied onto a new Word document, save the document and submit it
through Google Classroom.
Graphing Periodic Trends
Data Table
Element
Symbol
Atomic
#
Atomic
Radius (pm)
Ionization
Energy
(kJ/mol)
H
He
Li
Be
B
C
N
O
F
Ne
Na
Mg
Al
Si
P
S
Cl
Ar
K
Ca
Sc
Ti
V
Cr
Mn
Fe
Co
Ni
Cu
Zn
Ga
Ge
As
Se
Br
Kr
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
53
31
167
112
87
67
56
48
42
36
190
145
118
111
98
88
79
71
243
194
184
176
171
166
161
156
152
149
145
142
136
125
114
103
94
88
1311
2371
520
899
800
1086
1402
1313
1680
2080
496
737
577
786
1011
999
1251
1520
419
590
633
659
651
653
717
762
760
737
745
906
579
762
944
941
1139
1350
Electronegativity *
(Pauling Scale)
Ionic
Radius*
(pm)
2.20
0.98
1.57
2.04
2.55
3.04
3.44
3.98
60
31
20
15
171
140
136
0.93
1.31
1.61
1.90
2.19
2.58
3.16
95
65
50
41
212
184
181
0.82
1.00
1.36
1.54
1.63
1.66
1.55
1.83
1.88
1.91
1.90
1.65
1.81
2.01
2.18
2.55
2.96
3.00
133
99
106
96
88
81
75
74
72
72
96
88
62
53
222
198
195
Graphing Periodic Trends
Once your graphs are submitted to Google Classroom, pick up a copy of the graphs on the front
table and complete the Data Analysis.
Data Analysis: .
1. Label each point on each graph with the correct symbol.
2. Use a colored pen or pencil to draw a vertical line that represents the beginning of each period.
Analysis Questions:
1. Define the following terms:
a. Period
b. Group (Family)
c. Atomic radius
d. Ionic radius
e. Effective Nuclear Charge
f. Shielding Electrons
g. Electronegativity
h. Ionization Energy
2. Based on your graphs, what is the trend in atomic radius:
Across a period? Why?
Down a family? Why?
3. Based on your graphs, what is the trend in ionization energy:
Across a period? Why?
Down a family? Why?
4. Based on your graphs, what is the trend in ionic radius:
Across a period? Why? (be sure to include information on (+) ions vs, (-) ions)
Down a family? Why?
5. Based on your graphs, what is the trend in electronegativity:
Across a period? Why?
Down a family? Why?