Democritus John Dalton Robert Millikan Dmitri Mendeleev
I am hesitating between 4 options to answer the following question, which option should I choose?
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?
Possibilities:
- Democritus
- John Dalton
- Robert Millikan
- Dmitri Mendeleev

Dmitri Mendeleev