Jöns Jacob Berzelius, a Swedish chemist, refined the theory by developing a system of chemical notation and identifying the law of constant composition. Later, Amedeo Avogadro and Stanislao Cannizzaro resolved the critical issue of diatomic molecules (like oxygen gas, O₂), distinguishing between atoms and molecules.
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This clarification was essential for the theory to accurately describe physical states and reactions. He noted that elements always combined in fixed, simple ratios by mass, a pattern difficult to explain unless matter was composed of discrete particles.
Later Validation and the Modern Atom While Dalton ignited the field, his specific model required corrections. Later, Amedeo Avogadro and Stanislao Cannizzaro resolved the critical issue of diatomic molecules (like oxygen gas, O₂), distinguishing between atoms and molecules.
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His theory rested on several key postulates: elements are made of tiny indivisible particles called atoms, atoms of the same element are identical, atoms of different elements differ in mass and properties, and chemical reactions involve the rearrangement of these atoms. The Pre-Daltonian Philosophers Long before test tubes and quantitative analysis, the concept of indivisible particles appeared in the writings of ancient philosophers.
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