Question

Who was one of the first people to suggest that matter is made up of particles that cannot be divided?

Answer 1

Don't quote me on it but I believe the first one was Democritus in the time of Ancient Greece. At the time he had no evidence though, just a lucky guess made by him.

Answer 2

Democritus was coined with the term “atom” John Dalton is more know for this with his atomic theory