Chemistry - Anne Tindale (Chapter 4)

Chapter 4 - The Periodic Table

• The Periodic Table is a classification of all Elements according to there Atomic Number.
• It is comprised of Horizontal Periods and Vertical Groups.
• They are arrange in order of increasing atomic number, electron structure and chemical properties.

Periods

• These are horizontal rows of elements.
• They are numbered 1 to 7
• Elements from the same period have the same number of electron shells
• Across a period (left to right), Protons and electrons increase by 1 more than the previous element.
• Across a period (left to right), Elements become less metallic and more non- metallic

Groups

• These are vertical colums of elements.
• There are 8 Groups nubmered 1 to 7 and a final group 0
• Each element in a group has the same number of electrons in its outer shell. For elements in groups 1 to 7 the electron number is the same as the group number.
• The common oxidation number of element