Democritus+B5+Hayden

Learned his atomic theory from his teacher Leucippus. He said to his teacher "infinite in number and imperceptible because of the minuteness of their size. They move about in empty space (for there is empty space) and by joining together they produce perceptible objects, which are destroyed when the atoms separate." He also stated that the atom was irreducibly minimal quantity of matter. The problem this is theory was that he thought the atom could not be broken down. But there is protons, electrons, etc.