1. Chapter 20 Elements, Compounds and Mixtures
Robert Boyle an Irish Scientist discovered that substances
are made of atoms. He called these substances elements
There are over 100 different elements. Everything on earth is made up of elements. Elements are like pieces of lego and are used to make things

2. Names & Symbols of Elements
All the elements are listed in a table called the periodical table
All elements are given a symbol to identify them and they have a fixed position in the periodical table.

4. Molecules
When atoms join together they form molecules.

7. Mixtures
A mixture is made up of two or more substances which are mingled together but not chemically combined.
Examples of mixtures