In 1808, John Dalton proposed the atomic theory which can be summarized as follows:
• All element are made up of small, indivisible particles known as Atom.
• Atoms can neither be created nor destroyed.
• Atoms of the same element are alike in every aspect, and differ from atom of other elements.
• In combination of an atoms with other atoms, they do so in simple ratios.
• Combination or separation of atoms results to all chemical changes.
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