Yes, that's correct! Democritus is known for proposing the idea that matter is made up of indivisible particles called atoms. He believed that these atoms were:

* Small: He thought they were so tiny that they couldn't be further divided.

* Solid: He envisioned them as hard, solid particles.

* Indestructible: He believed that atoms could not be created or destroyed.

It's important to note that Democritus' theory was philosophical, not based on scientific experimentation. It took centuries for the idea of atoms to be scientifically accepted and developed further.