An atom by definition as said by Webster dictionary is “The smallest particle of a substance that can exist by itself or be combined with other atoms to form a molecule.” Before we had any of this knowledge, many of philosophers and many of scientists worked on the idea of atom. One of the earliest philosopher that studied Atoms was Democritus. Democritus was very influential Ancient Greek philosopher. He was the one who created the Atomic Theory, but he didn’t create it himself, it was his mentor’s idea, which he made famous. His theory was not accepted, because he didn’t Explain the chemical behaviors, and had no experimental support that was based on the scientific method. Though Democritus was on the right track and got rejected because