Democritus John Dalton Robert Millikan Dmitri Mendeleev
I gave my students this multiple choice question: The relationships among elements were used to organize the elements systematically long before the behavior of electrons was understood. Which scientist is credited with this organization of elements?

Only one answer is correct among these 4 choices:
- Democritus
- John Dalton
- Robert Millikan
- Dmitri Mendeleev

Could you tell me which one is correct?

Dmitri Mendeleev