1. The Periodic Table of Elements
Dmitri Mendeleev published the first periodic table in 1869
Made it possible for scientists to predict the existence of elements that had not been discovered yet
periodic table song

2. Organization Periodic means- happening at regular intervals
Arranged in increasing atomic mass and atomic number
Periods are the horizontal rows of elements
Same number of energy levels for electrons
Groups or families are the vertical column of elements
Share chemical properties
Same # of valence electrons

3. Groups are vertical
Periods are horizontal

4. Periodic Law
The repeating chemical and physical properties of elements change periodically with the element atomic number

5. Metals, Nonmetals, & Metalloids
Most elements are metals
Found to the left of the zigzag line
Properties: malleable or ductile, good electric & thermal conductors

6. Nonmetals Found to the right of the zigzag line
Properties: malleable or ductile

7. Metalloids Border the zigzag line Properties of metals and nonmetals
Properties: shiny, brittle, hard, good conductors of electric current

8. Groups Alkali metals- found in group 1 of the periodic table
Contains metals
Electrons in outer energy level 1
Electrons in the out level (VE) 1
Very reactive
Properties: soft, silver in color, shiny, low density

9. Alkaline-Earth Metals- found in group 2 of the periodic table
Contains metals
Electrons in outer level (VE) 2
Very reactive, but less than alkali metals
Properties: silver in color, higher density than alkali metals

10. Transition Metals- found in groups 3-12 of the periodic table
Contains metals
Electrons in the outer energy level (VE) 1 or 2
Less reactive than alkaline earth metal group
Properties: shiny, good conductors of thermal energy & electric current, higher densities and melting points of groups 1 and 2

11. Halogens- found in group 17 of the periodic table
Contains nonmetals
Electrons in the outer energy level (VE) 7
Very reactive
Properties: poor conductors of electric current, violent reactions with alkali metals to form salts, never in pure form in nature

12. Nobel Gases- found in group 18 of the periodic table
Contains nonmetals
Electrons in the outer energy level (VE) 8
Nonreactive
Properties: colorless, odorless, gases at room temperature

13. Vocabulary Make index cards for the following terms for homework.
Periodic alkali metal
Period alkaline-earth metal
Group halogen
Periodic law noble gas
Valence electron