Did the Arabs of antiquity know about the atom, or does its mention in the noble verse: "So whoever does an atom's weight of good will see it" differ from its physical concept?

In the Holy Quran and the Arabic language, "dharrah" (ذرة) refers to a tiny ant or the small specks of dust visible in sunlight, signifying the minutest of deeds. Ibn Hajar, in Al-Fath, mentioned that a "dharrah" is a tiny ant or a single speck of dust, and that it may be considered weightless. Ibn Uthaymeen stated that "dharrah" refers to small ants, and not the atom known today in physics, because the Quran addresses people in a way they understand. The "dharrah" was mentioned as an example of scarcity, as in the Almighty's saying: "So whoever does an atom's weight of good will see it" (Quran 99:7), and His saying: "Indeed, Allah does not wrong [even] an atom's weight; and if there is a good deed, He will multiply it" (Quran 4:40). If "dharrah" is used among physicists with another meaning, there is no objection, but the Quran is not to be interpreted by newly coined terms that contradict what the language indicated at the time of revelation.