who was the first person to suggest the existence of atoms? dalton democritus proust thomson done

who was the first person to suggest the existence of atoms? dalton democritus proust thomson done
Answer
Brief Explanations:
Democritus, a Greek philosopher in ancient times, first proposed the existence of atoms. He believed that matter was composed of tiny, indivisible particles called atoms. Dalton is known for his atomic - theory in modern chemistry. Proust is associated with the law of definite proportions. Thomson discovered the electron.
Answer:
B. Democritus