1. Phenomenon: The periodic table is like a grocery store

2. Periodic Puzzle Organize the pieces into four groups and four periods
There should be three trends incorporated into your puzzle arrangement
What are the three trends?
What are trends?
How does this activity relate to the periodic table?

3. Reading
Where did Mendeleev het his idea of how to arrange the periodic table?
On the periodic table, what does Mendeleev say repeats?
In each column what do elements have in common?
Why did Mendeleev leave blanks on the table?