Among the French Cartesians of the second half of the seventeenth century, Géraud de Cordemoy stands out as the most radical. He was one of the first to argue that Cartesian metaphysics imply occasionalism, and he was alone in arguing that those same metaphysical commitments lead to atomism. This paper addresses the second of these positions. Following a discussion of what is taken to be the strongest version of his argument for atomism, consideration will turn to an objection against Cordemoy, one that was raised in his own day by Gottfried Leibniz and more recently by Steven Nadler. The paper concludes with a response offered on Cordemoy's behalf.