Periodic-Trends-Lab
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Central Piedmont Community College *
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INORGANIC
Subject
Chemistry
Date
Dec 6, 2023
Type
Pages
6
Uploaded by GeneralOysterMaster820
1.
Examine atomic radius, electronegativity, and first ionization energy of elements.
2.
Create scatter plots of atomic radius, electronegativity, and 1
st
ionization energy with atomic number
3.
Discover periodic and group trends for these properties.
Using your textbook or Internet, define the following terms
IN YOUR OWN WORDS
.
a) Electronegativity: Electronegativity is a measure of the tendency of an atom to attract
a bonding pair of electrons in a covalent bond.
b)
Atomic Radius: Size of an atom
c)
Ionization Energy: Amount of energy required to remove an electron from an atom
d)
Period: Horizontal row of elements
e)
Group: Vertical column of elements
1. Go to
PTable.com
and use the interactive Periodic Table to complete the lab. (Alternate PT
https://www.rsc.org/periodic-table/trends
)
2. Create a data table in Excel. You may copy and paste the one I have provided.
Enter the data described in
Steps 3.
a
If you do not have Excel on your personal computer, you can access it through the
CPCC Cloud
.
Log in using your school username and password. https://cloudgw.cpcc.edu/
3. Record the atomic radius, electronegativity, and first ionization energy into your data table. For each
property, click on the corresponding box on the left hand side of the interactive periodic table to see the
values populate on the table.
4. Fill in the Noble Gas Electron Configuration for each element in the table.
5. Create a graph for
Atomic Radius vs. Atomic Number
. Follow the directions below to plot the graph.
Video help for creating a scatter plot
: https://www.youtube.com/watch?v=MfEAEmdFOBo
a) On the Excel spreadsheet highlight the numbers in columns for Atomic Number and Atomic Radius
b) Choose Insert --- Chart
c)
Choose scatter plot. – Choose the bottom right one- scatter with straight lines and markers
d)
Click on the Layout Tab and Chart Title. Label your first graph: Atomic Radius vs. Atomic Number
e)
Click on the Axis Titles and label the Vertical Axis: Atomic Radius (picometers) and horizontal axis:
Atomic Number
f)
Click on Gridlines and turn on major gridlines for both horizontal and vertical.
g)
Copy and paste the graph in a word document or google doc.
6. Create a graph for
Electronegativity vs. Atomic Number
. Save the graph in the same Word/Google
document.
7. Create a graph for
1
st
Ionization Energy vs. Atomic Number
. Save the graph in the same Word/Google
document.
8.
Include your first and last name at the top of the page
and answer the analysis questions listed below.
Recreate (copy/paste) this data table in Excel or Google Sheets
Table 1: Properties of Elements
Atomic
Number
Element
Atomic
Radius
(pm)
1
st
Ionization
Energy
(kJ/mol)
Electronegativity
(Pauling)
Noble Gas Electron Configuration.
1
H
190
1312
2.20
1s^2
2
He
31
2372.3
N/A
1s^2
3
Li
167
520.2
0.98
1s^2 2s^1
4
Be
112
899.5
1.57
1s^2s^2
5
B
87
800.6
2.04
1s^2s^2p^1
6
C
67
1086.5
2.55
1s^2 2s^22p^2
7
N
56
1402.3
3.04
2s2 2p3
8
O
48
1313.9
3.44
2s2 2p4
9
F
42
1681
3.98
2s2 2p5
10
Ne
38
2080.7
N/A
1s2 2s2 2p
11
Na
190
495.8
0.93
3s1
12
Mg
145
737.7
1.31
3s2
13
Al
118
577.5
1.61
3s2 3p1
14
Si
111
786.5
1.90
3s2 3p2
15
P
98
1011.8
2.19
3s2 3p3
16
S
88
999.6
2.58
3s2 3p4
17
Cl
79
1251.2
3.16
3s2 3p5
18
Ar
71
1520.6
N/A
3s2 3p6
19
K
243
418.8
0.82
4s1
20
Ca
194
589.8
1.0
4s2
21
Sc
184
633.1
1.36
4s2 3d1
22
Ti
156
589.4
1.62
3d2 4s2
23
V
171
650.9
1.63
2s2 2p2
24
Cr
166
652.9
1.66
3d5 4s1
25
Mn
161
717.3
1.55
3d5 4s2
26
Fe
156
762.5
1.83
3d6 4s2
27
Co
152
760.4
1.88
3d7 4s2
28
Ni
149
737.1
1.91
3d8 4s2
29
Cu
145
745.5
1.90
3d10 4s1
30
Zn
142
906.4
1.65
3d10 4s2
31
Ga
136
578.8
1.81
3d10 4s2 4p1
32
Ge
125
762
2.01
3d10 4s2 4p2
33
As
11.4
947.0
2.18
1s2 2s2 2p6 3s1
34
Se
103
941
2.55
3d10 4s2 4p4
35
Br
94
1139.9
2.96
3d10 4s2 4p5
36
Kr
88
1350.8
3.0
3d10 4s2 4p6
1.
Atomic Radius vs. Atomic number.
Label the peaks and valleys with the symbol or name of the element.
Under the graph answer the following questions in complete sentences.
a)
Summarize trends for atomic radius
across a period
(left to right) and
down a group
(top to bottom).
The atomic radius generally decreases. For example, from left to right in the given data, the atomic
radius decreases from H to Ne.The atomic radius generally increases. For instance, from top to bottom,
the atomic radius increases from Li to Kr.
b)
Why does the atomic radius increase/decrease as you move from left to right across a period?
The atomic radius decreases as you move from left to right across a period because electrons are added
to the same energy level, but the increasing positive charge in the nucleus pulls the electrons closer,
making the atomic radius smaller.
c)
Why does the atomic radius increase/decrease as you move from top to bottom down a group?
The atomic radius increases as you move down a group because electrons are added to higher energy
levels, making the electron cloud larger and the atomic radius bigger.
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[References]
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•X.
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OWLV2 | Online teaching and learning resource from Cengage Learning
[References]
Use the References to access important values if needed for this question.
The following Lewis diagram represents the valence electron configuration of a main-group element.
The element in period 3 that has this valence electron congfiguration is
1A
8A
H 2A
3A 4A 5A 6A 7A He
Li Be
B CNO F Ne
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6B 7B
1B 2B Al Si P S CI Ar
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Cs Ba La Hf Ta W Re Os Ir Pt Au Hg TI Pb Bi Po At Rn
Fr Ra Ac Rf Ha
Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Th Pa UNp Pu Am Cm Bk Cf Es Fm Md No Lr
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