1. 8th Grade
The Periodic Table

3. Dmitri Mendeleev
Discovered that patterns appeared when elements were arranged in order of increasing atomic mass.
He published the first periodic table.

4. Arranged by similar properties
Periodic Table
Made up of elements
Arranged by similar properties

5. Groups or Families
Vertical columns on the table – indicate # of valance electrons...number yours now!
Elements have similar properties

6. Groups or Families (cont)
Group 1-Alkali Metals
Group 2 Alkaline Earth Metals
Groups 3-12 Transition Metals
Groups – Named by top element in each group

7. Groups (cont)
Group 13-Boron Family
Group 14-Carbon Family
Group 15-Nitrogen Family
Group 16-Oxygen Family
Group 17 – Halogens
Group 18 – Noble Gases

8. Periods Horizontal line of elements
Arranged by number of electron energy levels
Each period has the same number of shells.
Text

9. Lithium (Period 2) – only valence electron shown
Energy Level Example
Lithium (Period 2) – only valence electron shown

10. Metals, Non Metals, & Metalloids
Elements separated by zigzag line.
Left of line are metals
Right of line are non-metals
Elements on either side of zigzag are metalloids.

12. METALS
Elements on the LEFT side of the periodic table; have a shiny surface and are good conductors of electricity

13. NON METALS
Elements on the RIGHT side of the periodic table; dull and are not good conductors of electricity

14. METALLOIDS
Elements that are to the LEFT AND RIGHT of the zigzag line; have some characteristics of metal and non metal

15. Periodic Table Mini Quiz. you may use your notes
Periodic Table Mini Quiz...you may use your notes. Directions: Get out paper and answer the following questions.

16. Answers!!! 1. Alkali metals 2. Cl, F, Br, I
3. Eight, except Helium which has only 2 valence electrons.
4. Number of valence electrons.
5. They are the same.
6. The number of shells.
7. Either side of the zigzag line on the periodic table.
8. To separate the metals from the nonmetals.
Text