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August 1, 2025
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1803 - 1805 John Dalton's discovery atoms (dec 30, 1802 – nov 26, 1803)

Description:

John Dalton established the atomic theory, proposing that elements are made of atoms and that compounds are formed by combinations of atoms.

Added to timeline:

Date:

dec 30, 1802
nov 26, 1803
~ 11 months