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Who was the first known contributor to the atomic theory? Select one: a. Thomson b. Bohr c. Dalton d. Democritus
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Who was the first known contributor to the atomic theory? Select one: a. Thomson b. Bohr c. Dalton d. Democritus

User Vlad Dumitrescu
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It would be D Democritus
He contributed in around 460-370 BC
Whereas the others contributed much later from around 1700's - 1900's
User Finferflu
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Who was the first known contributor to the atomic theory? A. Bohr B. Dalton C. Thomson D. Democritus
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