1. Periodic Table of Elements
Objectives:
Describe the arrangement of the PTE
Explain characteristics of families and trends on the table

2. 1869 Dmirtri Mendeleev Organized by atomic mass
Predicted undiscovered elements

3. 1913 Organized by atomic number Fixed Mendeleev’s problems
Henry Moseley
1913 Organized by atomic number Fixed Mendeleev’s problems

4. Metals, nonmetals and metalloids
Organization
Metals, nonmetals and metalloids

5. True Configuration

6. Groups (families)—columns Periods--rows
Groups and Periods
Groups (families)—columns Periods--rows

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

8. First Ionization Energy
Terms
Valence Electrons—
Electrons in the outermost energy level
Atomic radius
Distance from nucleus to outer boundary
First Ionization Energy
Energy required to remove an e- from a neutral atom

9. Increases LEFT and DOWN
Periodic Trends
Atomic Radius
Increases LEFT and DOWN

10. First Ionization energy:
Trends
First Ionization energy:
Increases RIGHT and UP

11. Electronegativity
Tendency of an atom to attract e- Affected by both atomic number and atomic radius (distance valence e- are from nucleus)

12. Group #= number of valence e- (except He)
More Trends 
Group #= number of valence e- (except He)
Families have similar reactivity since they have the same number of valence e-
Period Number= # of energy levels

13. Dots represent valence e-
Lewis Dot Structures
Dots represent valence e-

14. Fill in your Table
Group Number Period Number Color Metals one color, nonmetals anther color and metalloids another color Make a key at the top of your Periodic Table

15. On Your Own
Atomic Radius: Which is bigger? H or Li, Ca of Mn, Pt or Ag, Ne or Ar How many valence e-? Mg Al Si Ar Cl C B Rb How many energy levels? Rb K Na Mg Bi P S F Which has a lower Ionization energy? Ca or K, Al or P, Ga of Be, Cs or Se Which has a higher electronegativity? For Ne, Ar or N, Be or Mg, As, or S Lewis Dot Structure: Draw it! For the ones where you identified the number of Valence e- up above. 