![]() ![]() The atoms were unchangeable, indestructible, and always existed. He taught that there were substances called atoms and that these atoms made up all material things. This webpage provides an overview of the historical development and basic principles of atomic theory, from Dalton to Bohr and beyond. One of these philosophers was Democritus (460-370 B.C.E.), often referred to as the 'laughing philosopher' because of his emphasis on cheerfulness. The law of conservation of mass states that the total mass present before a chemical reaction is the same as the total mass present after the chemical reaction. Many consider 2008 the 200th anniversary of atomic theory, John Dalton’s momentous theory of the nature of matter. Atomic Theory is the foundation of chemistry, explaining the structure and behavior of atoms and molecules. Scientists did not account for the gases that play a critical role in this reaction. Atoms cannot be divided, created, or destroyed. ![]() ![]() \) shows that the burning of word does follow the law of conservation of mass. John Dalton (1803) stated, 'When two elements combine with each other to form two or more compounds, the ratios of the masses of one element that combines with the fixed mass of the other are simple whole numbers. Daltons atomic theory consists of four main points: All matter is made of small particles called atoms. ![]()
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