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Daltonâs atomic theory Daltonâs atomic theory proposed that: â¢All matter consists of tiny particles called atoms, which cannot be broken up. â¢All the atoms of a particular element have the same mass and the same behaviour, but are different to the atoms of other elements. â¢When atoms combine, they do so in proportions of small whole numbers to form âcompound atomsâ (what we call âmoleculesâ). Atoms cannot be created or destroyed in a chemical reaction.