1. I. History of the Periodic Table Mendeleev Mosely

2. A. Dmitri Mendeleev Dmitri Mendeleev (1869, Russian)
Organized elements by increasing atomic mass.
Predicted the existence of undiscovered elements.

3. B. Henry Mosely Henry Mosely (1913, British)
Organized elements by increasing atomic number.
Fixed problems in Mendeleev’s arrangement.

4. Terms
Periodic Law
Properties of elements repeat periodically when the elements are arranged by increasing atomic number.

5. I. Organization Metallic Character Rows & Columns Table Sections
The Periodic Table
I. Organization
Metallic Character
Rows & Columns
Table Sections

6. State of Matter Look at your periodic table
Some chemical symbols are black, red, and blue
Black – Solid
Blue – Liquid
Red – Gas

7. C. Columns & Rows
Group (Family)
Period

8. Periods Have the same number of energy levels
Same number “shells” in a Bohr diagram!

9. Groups Have the same outer electron arrangement
Same number of valence electrons!

10. A. Metallic Character
Metals
Nonmetals
Metalloids

11. Metals Properties Lustrous (shiny) Malleable (can be hammered)
Conduct heat and electricity

12. Metals Groups on Periodic Table: Group 1: Alkali Metals
Group 2: Aklaline Earth Metals
Groups 3-12: Transition Metals
Lanthanides
Actinides
Some elements in groups 13-15

13. Nonmetals Properties: Poor conductors of heat and electricity Brittle
Located upper right side of periodic table

14. Nonmetals Groups on Periodic Table: Group 17: Halogens
Group 18: Noble Gases
Non-reactive

15. Metalloids Properties:
Some properties of metals and some properties of nonmetals
Make good semiconductors

16. Metalloids
Elements:
B, Si, Ge, As, Sb, Te, Po, and At

17. Color Your Periodic Table
Metalloids: Orange
Alkali Metals: Green
Alkaline Earth Metals: Brown
Transition Metals: Purple
Lanthanide Series: Red dot lower right corner
Actinide Series: Blue dot in lower right corner
Halogens: Pink
Noble Gases: Yellow

18. B. Periodic Trends Group # = # of valence e- (except He)
Families have similar reactivity.
Period # = # of energy levels 1A 2A
3A 4A 5A 6A 7A 8A

19. C. Dot Diagrams
Dots represent the valence e-.
EX: Sodium
EX: Chlorine