2. Roots
• Created in 1869 by Dimitri
Mendeleev.
• Organized by Atomic Weight.
• Created before Rutherford’s model
and Schrodingers model
3. Where was it created
• Was created by a Russian Scientist.
• Made to organize elements.
4. Elements
• There are 118 elements.
• They are categorized by Atomic
weight.
• The are numbered 1-118
• There Atomic Weight is the decimal
number on the bottom.