1. THE PERIODIC TABLE

2. The Periodic Table: Your Friend…

3. When something occurs at regular intervals (you can predict what happens / comes next) PERIODIC

4. So what makes the periodic table periodic? ATOMIC NUMBER!!! (across the chart) AKA: “Z”

5. The properties of the elements are a periodic function of their atomic numbers PERIODIC LAW

6. .

7. All of the elements in a horizontal row PERIOD

8. All of the elements in a vertical column (aka Family) GROUP

9. Dmitri Mendeleev (1834-1907) invented the periodic table based on increasing atomic mass …and yes, he too, is your friend

10. Henry Moseley (1913) revised the periodic table based on properties and atomic number …and yes, he too, is your friend

11. s 1 group ALKALI METALS Good Conductors

12. s 2 group ALKALINE EARTH METALS Harder, more dense, stronger than alkali

13. d sub energy level TRANSITION METALS Columns 3-12

14. 4f sub energy level LANTHANOID SERIES Z = 57-70

15. 5f sub energy level ACTINOID SERIES Z = 89-102 All have radioactive forms (unstable p + & N °)

16. Columns 13, 14, 15, 16 are named by the first element in the column (e.g. Boron Group)

17. p 5 group HALOGENS Combine with metals to form salts Very reactive

18. p 6 group NOBLE GASES Inert gases (not reactive) 8 valence electrons