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John Dalton's Atomic Theory
          In 1803, John Dalton put forward his opinion about the atom. Dalton's atomic theory was based on two laws, namely the law of conservation of mass (Lavoisier law) and legal permanent arrangement (legal prouts). Lavosier mennyatakan that "The total mass of substances before the reaction will always equal the total mass of the reaction substances". While Prouts states that "Comparison of the mass of the elements in a compound always remain". From both legal Dalton expressed the opinion of the atoms as follows:
1. Atoms are the smallest part of matter that has not be subdivided
2. Atom is described as a very small solid ball, an element has atoms are identical and different for different elements
3. Atoms combine to form compounds with a ratio of integers and simple. For example, water consists of hydrogen atoms and oxygen atoms
4. The chemical reaction is the separation or amalgamation or a rearrangement of atoms, so that atoms can not be created or destroyed.

Hypothesis Dalton atomic model as illustrated by solid balls as the shot-put.