1. The Periodic Table
Chapter 4

2. Elements
Elements can be classified into three different categories according to their physical properties.

4. Metals: Left of staircase
Shiny
Malleable
Good conductors

5. Nonmetals: right of staircase
Dull
Brittle
Poor conductors

6. Semimetals or metalloids: on staircase
Combination of metal & nonmetal properties

8. Representative Elements
1A - 8A
Group # = # electrons in the outermost energy level

9. Group vs. Period Group = Columns Period = Rows Example: Group 1A
Elements in the same group share similar chemical and physical properties.
Period = Rows

10. Alkali Metals

11. Group 1A

12. Alkaline Earth Metals

13. Group 2A

14. Halogens

15. Group 7A

16. Noble Gases
Inert gases
Don’t participate in chemical reactions

17. Group 8A

18. Group B Elements
Transition Metals
Inner Transition Metals

19. Transition Metals
Metallic elements

20. Inner Transition
Lanthanides
Actinides

21. Other Notations