1. Unit 4 Chapter
Periodic Table Part 1

2. The Periodic Table
The Periodic Table was first put together by Demitri Mendeleev.

4. Mendeleev’s Table (~1872) Arranged according to increasing atomic mass
Elements with similar properties placed in the same vertical column
Missing elements were yet to be discovered and were left blank on the table

5. Henry Moseley – ( )
British Physicist determined the atomic numbers of the elements
He arranged the periodic table in order of atomic number
His periodic table is the one used today

6. Periods –
horizontal rows of the Periodic Table
There are 7 Periods

7. Periodic Law –
When the elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties.

8. Groups – vertical columns of elements on the Periodic Table
Groups are also known as families because they have similar properties.

9. Representative Elements
Group A elements

10. Alkali Metals – Group 1-A elements
Alkaline Earth Metals – Group 2-A elements
Halogens – Group 7-A elements
Noble Gases – Group 0 elements

11. Group B Elements
Transition Metals – In the middle of the Periodic Table
Inner Transition Metals (rare earth metals) – bottom of the Periodic Table

12. Please label your periodic table with the following:
Color the families as follows:
Alkali metals – red
Alkaline earth metals – yellow
Halogens – green
Noble gases – blue
Please outline the representative elements in purple and the transition metals in orange.
Make a key to your colors on the top of the page along with definitions of each family in your own words.

13. Classification of Elements
Metals – found on the left-side of the Periodic Table
Nonmetals – found on the right-hand side of the Periodic Table
Metalloids (or semi-metals) – along the stair-step line
Properties are intermediate between metals and nonmetals

14. Classification of Elements
Metals are…
Malleable – can be hammered into sheets
Ductile – can be drawn into wires
Shiny or Lustrous
Good conductors/poor insulators of heat and electricity
All solids at room temperature except Hg
Non-metals are…
Brittle but often form crystals
Dull
Good insulators/poor or non-conductors of heat and electricity
Solids, liquids and gases at room temperature
Metalloids
Have properties that are intermediate between metals and nonmetals.

15. Please label your periodic table with the metals, nonmetals and metalloids. Add definitions of these groups on the top of the page.