SB 3.11.2
sata eva padarthasya
svarupavasthitasya yat
kaivalyam parama-mahan
aviseso nirantarah
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Atoms are the ultimate state of the manifest universe. When they stay in their own forms without forming different bodies, they are called the unlimited oneness. There are certainly different bodies in physical forms, but the atoms themselves form the complete manifestation.