1. How elements are organized
Chapter 2 Section 1

2. Introduction Scientists started to organize elements in the 1700s
Tried to group according to their properties

3. Mendeleev’s Periodic Table
Mendeleev, a teacher and chemists, was writing a text book and needed a way to organize the elements
Created a set of cards
Each card had
Element
Mass
Known properties
Figured to organize them by their Atomic Mass

4. Periods and Groups
Periods go from left to right
Groups go up and down

5. Periodic Table
Called the Periodic Table because of the repeating pattern
Columns are called groups or families
Similar but not identical
Rows are called periods
Interval between repetitions

6. Predicting the Future What do you notice about Mendeleev's table below

7. Modern Periodic Table
Still organized using the Mendeleev’s concept just more detailed information

8. Complete Atomic Structure and Periodic Table Worksheet on the back

9. Bill Nye-atoms and molecules
Complete worksheet on the back of page 5 (guided reading 1.1)