Question

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

Explanation:

Democritus, an ancient Greek philosopher, was the first to propose the existence of atoms (indivisible particles) as the basic building blocks of matter. John Dalton developed modern atomic theory, Joseph Proust is known for the law of definite proportions, and Ernest Rutherford conducted experiments on atomic structure.

Answer:

B. Democritus