1. The Periodic Table

2. The Modern Periodic Table
Arranged in order of increasing atomic number

3. Properties of Elements
Metals Metalloids Nonmetals

4. Metals – MOST of the Periodic Table
Good conductors of heat and electric current
High luster or sheen (shiny)
Solids at room temperature (except for Hg)
Ductile
Malleable
MORE REACTIVE ON LEFT

5. Nonmetals – upper right corner
Variation in properties
Not metals
Mostly gases at room temperature
Generally, poor conductors
Solids tend to be brittle

6. Metalloids – the “stairstep”
Properties similar to metals and nonmetals
Behavior (metal or nonmetal) depends on conditions

7. Periodic Law When arranged in order of increasing atomic #, elements
show similar properties within groups (this has to do with
their electron configurations).
Group = column
Period = row

8. Group 1A: Alkali Metals Most reactive metals: 1 VALENCE ELECTRON

9. Group 2A: Alkaline Earth Metals
Less reactive than Group 1A metals: 2 valence electrons
Alkaline
Earth
Metals

10. Group 7A: Halogens Most reactive nonmetals: 7 valence electrons

11. Group 8A: Noble Gases
“Inert Gases:” 8 valence electrons (except for He – 2)
Rarely react because highest energy level is FULL.
Noble
Gases

12. B-Groups: Transition Metals