ASSESSMENT TASK SHEET: Science, Grade 9
Task Title: Periodic Table Graphing
Important Dates
Assigned: Tuesday, November 11, 2014
Assessment Criterion
Criteria C: Processing and Evaluating
Due: Thursday, November 13, 2014
Unit Chemistry
Global
Scientific and Technical Innovation
Context
Key The concept of structure, pattern
Related
Concept and systems.
Concept
Statement
of Inquiry
Structure of atom, arrangement of
sub atomic particles, trend of
properties.
How do we make sense of the properties of elements and how can we use them?
 Communication
 Social
 Self Management
 Research
 Thinking
ATLs: Students will manage their time to make a graph and draw conclusions over
the course of two class periods.
Instructions:
Periodic Trends: A Graphical Analysis
Elements on the periodic table are arranged in such a way that they exhibit patterns in their
properties. In this lab you will graph 4 periodic properties (atomic radius, ionization energy,
electronegativity, and ionic radius) and analyze the patterns.
DAY 1: To be completed in class and handed in:
Graphing
 You will graph the data by hand using a full piece of graph paper for each property.
 The x-axis will be the Atomic Number and the y-axis will be Atomic Radius.
 On the other graphs the y-axis will change to Electronegativity, Ionization Energy
and Ionic Radius respectively (totally 4 different graphs).
 The graphs need to have a title, and both axis label with appropriate units. Your
graphs should be oriented in the landscape direction.
 Using a colored pen or pencil and ruler, refer to table 1 and draw a vertical line
between atomic number 2 and 3, 10 and 11, and 18 and 19, separating the elements
into the first four periods. Label the sections appropriately.
DAY 2: To be completed in class and handed in:
Analysis Questions
 Write the answers for the analysis question on the paper provided. Full, complete
sentences.
 Fill in the reflection and submit the ATS with the Analysis Questions
Assessment Criterion C: Processing and Evaluating
1-2
Graphing
Concluding (Evaluated
through Analysis Questions)
Reflection:
3-4
5-6
A graph is made for each
trend
Graphs are somewhat
clear including axes labels
Graphs are very clear
including axes labels,
units, title, ruler is used
Most questions attempted
but interpretation of data
does not match graphs
Most questions attempted
and interpretation of data
usually matches graphs.
All questions answered
with data and match the
results on the graphs.
Scientific reasoning is
mostly clear.
7-8
Graphs are incredibly clear
including axes labels, units,
title, ruler is used, data
points are easy to see
All questions answered with
data and match the results
on the graphs. Scientific
reasoning is clear.
Table 1: Data for the first 36 elements on the Periodic Table.
Element
Symbol
Atomic #
Atomic Radius
(pm)
Ionization Energy
(kJ/mol)
Electronegativity *
(Pauling Scale)
Ionic Radius*
(pm)
H
1
53
1311
2.20
He
2
31
2371
Li
3
167
520
0.98
60
Be
4
112
899
1.57
31
B
5
87
800
2.04
20
C
6
67
1086
2.55
15
N
7
56
1402
3.04
171
O
8
48
1313
3.44
140
F
9
42
1680
3.98
136
Ne
10
38
2080
Na
11
190
496
0.93
95
Mg
12
145
737
1.31
65
Al
13
118
577
1.61
50
Si
14
111
786
1.90
41
P
15
98
1011
2.19
212
S
16
88
999
2.58
184
Cl
17
79
1251
3.16
181
Ar
18
71
1520
K
19
243
419
0.82
133
Ca
20
194
590
1.00
99
Sc
21
184
633
1.36
106
Ti
22
176
659
1.54
96
V
23
171
651
1.63
88
Cr
24
166
653
1.66
81
Mn
25
161
717
1.55
75
Fe
26
156
762
1.83
74
Co
27
152
760
1.88
72
Ni
28
149
737
1.91
72
Cu
29
145
745
1.90
96
Zn
30
142
906
1.65
88
Ga
31
136
579
1.81
62
Ge
32
125
762
2.01
53
As
33
114
944
2.18
222
Se
34
103
941
2.55
198
Br
35
94
1139
2.96
195
Kr
36
88
1350
3.00
*A Blank does NOT mean Zero. You will have some breaks in your graph. Your lines will stop and then start again
after the missing points.
Analysis Questions
Atomic Radius
Circle the points representing the elements in group 1 (atomic # 1, 3, 11, and 19) with a colored pencil or
pen and then circle data points representing the elements in group 18 (atomic # 2, 10, 18, and 36) with a different
color.
1. What is Atomic Radius?
2. Examine your graph. Find the period 2 elements (atomic numbers #3-10). What happens to the atomic
radius values as you move across period 2?
3. Find the period 3elements (atomic numbers #11-18) and the period 4 elements (# 19 – 36). Do period 3 and
period 4 have the same trend you saw in period 2?
4. Examine your graph. Find the group 1elements (atomic numbers #1, 3, 11, and 19). What happens to
atomic radius as you move down the group?
5. Do you see this same trend in group 18 elements (# 2, 10, 18, 36)?
6. Put the Summary of trend for atomic radius below the title on your graph: Atomic radius
_______________________ across a period and _________________________ down a group.
Electronegativity
Circle the points representing the elements in group 1 (atomic # 1, 3, 11, and 19) with a colored pencil or
pen and then circle data points representing the elements in group 17 (atomic # 9, 17, and 35) with a different
color.
1. What is electronegativity?
2. Examine your graph. Find the period 2 elements (atomic numbers #3-10). What happens to the
electronegativity values as you move across the period?
3. Do period 3 (#11-17) and period 4(#19 – 36) have the same trend you saw in period 2?
4. Examine your graph. Find atomic numbers #1, 3, 11, and 19 that correspond to the elements in Group 1.
What happens to electronegativity as you move down the group 1 elements?
5. Do you see this same trend in group 17 elements (# 9, 17, and 35)?
6. Which elements do not have an electronegativity value? Why do you think this is?
7. Put the Summary of trend for electronegativity below the title on your graph: Electronegativity
_______________________ across a period and _________________________ down a group.
Ionization Energy
Circle the points representing the elements in group 1 (atomic # 1, 3, 11, and 19) with a colored pen or
pencil and then circle data points representing the elements in group 18 (atomic # 2, 10, 18, and 36) with a
different color.
1. What is ionization energy?
2. Examine your graph. Find the period 2 elements (atomic numbers #3-10). What happens to the ionization
energy values as you move across the period?
3. Find the period 3elements (atomic numbers #11-18) and the period 4 elements (# 19 – 36). Do period 3 and
period 4 have the same trend you saw in period 2?
4. Examine your graph. Find atomic numbers #1, 3, 11, and 19 that correspond to the elements in Group 1.
What happens to ionization energy as you move down the group 1 elements?
5. Do you see this same trend in group 18 elements (# 2, 10, 18, 36)?
6. Put the Summary of trend for ionization energy below the title on your graph: Ionization energy
_______________________ across a period and _________________________ down a group.
Ionic Radius
Put a “+” over the points representing the cations in period 1 (atomic # 3-6), period 2 (11-14), period 3
(19-32) with a colored pen or pencil. Put a “-” over the other points representing the anions. Circle the points
representing the elements in group 1 (atomic #3, 11, and 19) with a colored pen or pencil and then circle data
points representing the elements in group 17 (atomic # 9, 17, and 35) with a different color.
1. How does an atom become a cation and an anion?
2. What happens to the ionic radius values of the cations (+) as you move across period 2?
3. What happens to the ionic radius values of the anions (-) as you move across period 2?
4. Do period 3 and period 4 have the same trend you saw in period 2 for both the cations and anions?
5. Examine your graph. Find atomic numbers #3, 11, and 19 that correspond to the elements in Group 1.
What happens to ionic radius as you move down the group 1 elements?
6. Do you see this same trend in group 17 elements (# 9, 17, and 35)?
7. Put the Summary of trend for ionic radius below the title on your graph: Ionic radius
_______________________ across a period and _________________________ down a group