or átomos, meaning “uncuttable.”
This is the Greek root of atom. Greek philosophers in the 5th century BCE got the idea that everything might be made up of tiny particles. These would be the smallest, indivisible unit of matter. (It was just an idea—they didn’t know for sure.)
They got this idea in ancient India even earlier, but we use the word chosen by the Greeks.
Now we know atoms exist and are cuttable (for instance, they’re made of protons). However, elements do not exist below the level of the atom. Cut up a gold atom and it won’t be gold anymore—it will just be the parts.