# Trends in the Periodic Table

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```Title: Trends in the Periodic Table
Introduction/Purpose: Pre Lab;
1. Look up the history of the periodic table and the contributions made by Dmitri Mendeleev and
Henry Moseley.
2. Look up the following terms:
Periodicity, group, period, electronegativity, atomic radius, ionization energy, valence electrons
Materials: Graph paper, ruler, CRT
Methods/Procedure: Explain how to make a graph (scale, title, units, etc)
1. Graph atomic numbers 1-18 (x axis) verse ionization energy, atomic radius, electronegativity. (y
axis)Total of 3 graphs. Make it nice nice. Use an appropriate scale.
Observations/Data/Diagrams: Explain what observations you can make from the graphs. Identify
relationships between the variables, going down a group, across a period, verse each other, etc.
Discussion/Analysis: NA
Conclusion: Answer the following questions:
1.
2.
3.
4.
5.
6.
What is the relationship between ionization energy as you go; a. across a period, b. down a
group? Why? Look it up.
What is the relationship between atomic radius as you go; a. across a period, b. down a group?
Why? Look it up.
What is the relationship between electronegativity as you go; a. across a period, b. down a
group? Why? Look it up.
What is the relationship between ionization energy and atomic radius? Direct/indirect
What is the relationship between ionization energy and electronegativity? Direct/indirect
What is the relationship between atomic radius and electronegativity? Direct/indirect
Figures and Graphs: Include 3 graphs
```