Lucretius' On the Nature of Things

Lucretius On the Nature of Things draws heavily on Epicurus’s ideas, translating them from Greek into Latin and putting them into his own poetic voice. It is therefore the best source we have for the ideas of  [classical Epicurean philosophy]. 

The atomic model is not more than a representational model of the physical universe up to a certain level of magnification. Modern science dives much deeper than atoms and ends up with no matter at all.