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Dalton's Atomic Theory Earlier we used the Particle theory of Matter to explain observations of matter. However, this theory cannot explain everything we have just learned regarding chemical changes. For example it cannot explain the electrolysis of water. John Dalton introduced a new theory to explain chemical changes. Dalton's Atomic Theory 1. 2. 3. 4. All matter is made up of small particles called atoms. Atoms cannot be created, destroyed or divided into smaller particles. All atoms of the same element are identical in mass and size, but are different in mass and size of other elements. Compounds are created when atoms of different elements link together in definite proportions. Compounds are described by chemical formulas. For Example: