Final answer:
Democritus was the first to suggest the existence of atoms, followed by John Dalton who supported the idea scientifically.
Explanation:
Democritus was the first person to suggest the existence of atoms. He proposed the idea of atomos, tiny indivisible solid objects, around 2,500 years ago. However, it was John Dalton in the early 19th century who supported this hypothesis scientifically, based on laws of conservation of mass and definite proportions.
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