This theory states that;

1. Elements are made of extremely small particles called ATOMS
2. Atoms cannot be subdivided, created nor destroyed
3. All atoms of a given element are identical in size, mass and other properties. Atoms of different elements differ in size, mass and other properties.
4. Atoms of different elements combine in simple whole ratios to form compounds. For example; The molecule of the compound water contains 1 atom of oxygen and 2 atoms of oxygen (H2O) HENCE a hydrogen to oxygen ratio of 1:2
5. An atom is the smallest particle of an element that can take part in a chemical reaction. A chemical reaction is necessary to combine, separate or rearrange atoms