1. Organization of the Periodic Table

2. History
Dmitri Mendeleev (1860s) was the first to organize the elements by atomic mass
Even predicted elements to be discovered
Grouped by families and similar properties
Not correct
Someone else organized it by atomic number
1914 Henry Mosely, determined number of protons in an atom

3. How are elements arranged?
Arranged according to their atomic number from left to right
Each element block contains the same type of info (atomic #, symbol, atomic mass)
Periods are the rows in the periodic table
Group OR Family is the vertical column
Arranged together because of their similar properties

4. Definition of Property
A property is a characteristic
You will see this word for the following units, get use to it!
EXAMPLES:
Physical
chemical

5. The Lanthanide and Actinide Series
Pg294
Rare Earth elements
Placed at the bottom of the table to save space

6. REGIONS OF THE PT Metals Nonmetals Metalloids Light blue area
Located to the left of the zig zag line
Nonmetals
Yellow area
Located to the right of the zig zag line
Metalloids
Light green area
Located at the zig zag line

8. Metals Located to the left of the zig zag line
Majority of elements are metals
Properties:
Luster
Metallic
Malleable
Ductile
Conductivity (heat and electricity)

9. Nonmetals Located to the right of the zig zag line.
Nonmetals are found in lasers, plastics, air your breathe
Carbon (nonmetal) is important to all living things
Properties:
Poor (not good) conductors of heat and electricity
Do not have luster
Cannot be easily shaped

10. Metalloids Located at the zig zag line AKA Semimetals
Have properties of both metals and nonmetals
Semiconductors – can conduct electricity
Silicon is an important semiconductor found in your computers and phones