1. Chapter 7: The Periodic Table of Elements

2. Ch 7 Section 1 Arranging the Elements

3. Vocabulary – Define on your own
periodic
Period
Group
Periodic law

4. Discovering a Pattern Dmitri Mendeleev Found pattern in 1869
Tried various properties: density, melting pt, etc
But by arranging by atomic mass, he saw the pattern repeat
Repeated every 7 elements

5. Discovering a Pattern Periodic  happens at regular interval
Mendeleev realized there were missing elements based on the gaps

6. Changing the Arrangement
Henry Moseley in 1914
Changed PTOE from atomic mass to atomic number

8. PTOE and Classes of Elements
Metals
Most common type of elements
Left of the zig-zag line in PTOE
Most are
Solid
Conduct electricity
shiny

9. PTOE and Classes of Elements
Non-metals
Almost have a full set of electrons
Usually a room temperature
Metalloids
Border the zig-zag region of PTOE
Have properties of metal & non-metals

10. Decoding the PTOE
Chemical Symbol
See previous notes

11. Period
Goes across the PTOE

12. Groups
Vertical column

13. Ch 7 Section 2
Grouping the Elements

14. Group 1: Alkali Metals
4-5 facts

15. Group 2: Alkaline-Earth Metals
4-5 facts

16. Groups 3-12: Transition Metals
4-5 facts