The Periodic Table

Organization Horizontal rows are called periods. - Each element in a period is in a different family or group.

Horizontal Rows

Organization Vertical columns are called families or groups. - Elements within a family can have many similar properties. - Their properties are similar because their atoms have a similar arrangement of electrons.

Vertical Columns

Metals Most of the elements are metals. They occupy the space to the left of the zigzag line.

Group 1

Group 2

Groups 3-12

Border the Zigzag Line Other Metals

Metalloids Elements that have properties of both metals and non-metals. Also known as semi-metals. Border both sides of the zigzag line.

Border the Zigzag Line Metalloids

Non-metals Occupy the upper-right corner of the Periodic Table. All non-metals, except Hydrogen are to the right of the zigzag line.

Non-metals

Group 17 – Salt Producing

Group 18 Outer Electron Shell is Full

13 Al Aluminum 27 Atomic Number Symbol (always PRINTED) Element Name Atomic Mass (sometimes a decimal) How to Read Each Box

Atomic Number = Protons = Electrons For Aluminum, there are 13 protons For Aluminum, there are 13 electrons Number of Protons, Electrons & Neutrons Atomic Mass # – Atomic # = Neutrons For Aluminum, there are: 27 – 13 = 14 neutrons 27 – 13 = 14 neutrons