1. Unit: Chemistry
Lesson 2: Organizing the Elements
Essential Questions:
1.) What did Mendeleev discover?
2.) What information does the periodic table contain?
3.) How is the periodic table useful?

2. What did Mendeleev discover?
Periodic table- an arrangement of the elements showing a pattern of their properties

3. What information does the Periodic Table contain?
Atomic number- the number of protons in the nucleus of an atom

4. Chemical symbol- a one or two letter abbreviation for an element

5. Atomic mass- average mass of all the isotopes of that element

6. How is the Periodic Table useful?
Periods- rows
Groups- columns