Question

who was the first to propose the existence of atoms?
john dalton
democritus
joseph proust
ernest rutherford

Explanation:

Democritus, a Greek philosopher, first proposed the existence of atoms. He theorized that matter was composed of indivisible particles called atoms. John Dalton is known for his atomic - theory in modern chemistry. Joseph Proust is associated with the law of definite proportions. Ernest Rutherford made contributions to understanding the atomic nucleus.

Answer:

B. Democritus