In 1803,(John Dalton) scientists British atomic for theory proposed use To explain the change of Mass before and after made reaction. including the ratio by mass of the elements the combined is a compound. which have essence is as follows
- Element consists of tiny particles called Atoms. cannot be separated from each other have.
- Atoms cannot be rebuilt or made lost have.
- Atoms of the same element have the equal mass and the treasure same but is different from the atoms of other elements.
- compounds result from combination between the atoms of the elements different type. By have a simple of number ratio or have number little.
- Atom of element two type up. will gathered by ratio Different. for to will be is compound to many type.