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1. Small particles called atoms exist and compose all matter; 2. They are indivisible and indestructible; 3. Atoms of the same chemical element have the same chemical properties and do not transmute or change into different elements.

— John Dalton

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Now it is one great object of this work, to shew the importance and advantage of ascertaining the relative weights of the ultimate particles, both of simple and compound bodies, the number of simple elementary particles which constitute one compound particle, and the number of less compound particles which enter into the formation of one more compound particle.

A New System of Chemical Philosophy (1808)

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Quote text and notes from Wikiquote: John Dalton (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.