Dalton's Atomic Theory posits that all matter consists of indivisible particles called atoms, which retain their identity during chemical reactions and combine in fixed whole-number ratios to form compounds. The theory establishes the formal definition of an atom as a fundamental unit of element-specific mass and charge neutrality within classical chemistry, distinguishing elements by unique atomic weights while maintaining conservation of mass throughout physical or chemical transformations. As a foundational axiom in stoichiometry and elemental analysis, this framework defines the structural basis for quantitative relationships between substances without invoking subatomic particles or isotopic variations inherent to modern quantum mechanics.
Prerequisite chain context: requires Atoms and Molecules.