Name: ____________________________________________ Date: ______________________________ Period: ______
Periodicity of Density – Prelab Activity – Graphing
Electronegativity
Objective: You will create a graph to predict the electronegativity of sodium.
Instructions:
1. You will create a scatterplot graph where the x-axis is the element’s period # and the
y-axis is electronegativity. Remember to include all 5 parts of the graph!
2. Plot the data points for the following elements . Under each dot – identify the
element by writing its atomic symbol (small).
3. In the same color – draw a line of best fit.
Symbol
H
Li
K
Rb
Cs
Period #
Electronegativity
2.1
1.0
0.8
0.8
0.7
4. In a second color, create a scatterplot (on the same graph) of the following data.
Include a line of best fit.
Symbol
Mg
Al
Si
P
S
Cl
Period #
Electronegativity
1.2
1.5
1.8
2.1
2.5
3.0
5. Sodium is in the _____ period. Look at where your two lines intersect. What is your
prediction for sodium’s electronegativity? __________________________________________.
6. The actual value for sodium’s electronegativity is 0.9. What is your percent error?
(show your work)
│actual – measured│x 100
actual
7. Why wasn’t argon included in the second data table? (Think about what you know
about electronegativity)
8. Why are we able to make a (hopefully reliable) prediction of sodium’s electronegativity
using this method?