1. Periodic Table of Elements
Jacqulyn Parsons

2. Discovery
In 1869, Dmitri Mendeleev organized the chemical elements into a periodic table similar to the one we use today. He had the elements in order based on the atomic mass. Today we have them in order based on the atomic number.

3. WHAT IT LOOKS LIKE

4. EACH ELEMENT
Each element is organized within the table based on its Atomic Number. But a lot of important information is given too.
Atomic Mass
Atomic Number
Element Symbol
Element Name

5. Details! Details! Details!
Atomic Mass = # of Protons + # of Neutrons
Atomic Number = # of Protons and # of Electrons
Symbol = Make sure to pay attention it isn’t always the first letters of element. Ex. Lead – Pb
Element Name

6. ORGANIZATION
The Periodic Table of Elements is organized in many different ways.
Group
Period
Family

7. Group
Groups The atoms of all elements in the same column are considered a group. This means they have the same number of outer-shell electrons.
Remember Groups go across the top! 1 through 18

8. Period
Period: The atoms of all elements in the same row are considered a period. This means they contain the same number of atomic shells.
Remember Periods go top to bottom. Numbered 1 through 7

9. Family
Elements are also grouped by family. These are elements with similar chemical properties.
Noble Gases
Halogens
Alkaine Earth
Alkail Metals
Transition Metals
Basic Metals
Semi Metals
Non Metals
Lanthanides
Actinides