Atom
Atom derives from Greek Atomos that means indivisible. The term atom was proposed by Greek philosopher, Leukippos and Democritus in 4th century BC. At that time there were two opinions about the division of matter, that is the opinion of Democritus and Aristotle.
a. Democritus
"The division of matter is discontinued. That is, if the material is divided and subdivided finally obtained the smallest particles called atoms."
b. Aristoteles
"The division of matter is continuous., Meaning that the division of matter can continue without limit."