For athietest proof regarding atoms

For Atheists: Proof regarding Atoms Prior to the Quran philosophers thought that the atom was the smallest indivisible component of matter.

However today we know that this was false. Atoms are composed of electrons, neutrons and protons. And lately it turned out that those neutrons and protons are made of quarks... However 1400 years ago the Quran contradicted the common knowledge of the time. It stated that the :atom is not the smallest part Whatever you may be doing, and whatever portion you " may be reciting from the Quran, and whatever deed you may be doing, We [Allah] do witness when you are doing it. And nothing is hidden from your Lord (so much as) the weight of an atom on Earth and in heaven, not less than that nor more but is (written) in a clear record" .((Quran 10:61 How could an illiterate man who lived 1400 years ago have known that the atom is not the smallest component ?of matter (Quoted from: http://www.speed-light.info/miracles_of_quran/atoms.htm )