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The History of the Atom - How Our Idea of Matter Evolved Our understanding of the atom didn’t appear overnight—it took over 2,000 years of scientific discovery. Democritus (400 BCE): Proposed that everything is made of tiny, indivisible particles called atomos. No experiments—just an idea ahead of its time. John Dalton (1803): Revived the atomic theory with evidence, saying atoms are solid spheres and each element has unique atoms. J.J. Thomson (1897): Discovered the electron and proposed the “p