1. Organization of the elements
The Periodic Table
Organization of the elements

2. History of the Table Dmitri Mendeleev Henry Moseley 1860s
Arranged elements by atomic mass
Henry Moseley
1913
Arranged elements by atomic number
we use this table today!

3. Periodic Law
Properties of the elements are a periodic function of their atomic number.
Elements in the same group have similar chemical and physical properties.

4. Color/Label your Periodic Table
Number groups 1-18 on top
Number periods 1-7 on side
Label metals, nonmetals, metalloids
Alkali metals – group 1
Alkaline earth metals – group 2
Transition elements – groups 3-12
Halogens – group 17
Noble gases – group 18
Lanthanides – first row across bottom
Actinides – second row across bottom