The word(s) "atom" appears 6 time(s) in 6 verse(s) in Quran in Mohsin Khan translation.

(1) Surely! Allah wrongs not even of the weight of an atom (or a small ant), but if there is any good (done), He doubles it, and gives from Him a great reward.

(2) Neither you (O Muhammad صلى الله عليه وسلم) do any deed nor recite any portion of the Qur'an, - nor you (mankind) do any deed (good or evil) but We are Witness thereof, when you are doing it. And nothing is hidden from your Lord (so much as) the weight of an atom (or small ant) on the earth or in the heaven. Not what is less than that or what is greater than that but is (written) in a Clear Record. (Tafsir At-Tabari).

(3) Those who disbelieve say: "The Hour will not come to us." Say: "Yes, by my Lord, the All-Knower of the Unseen, it will come to you; not even the weight of an atom (or a small ant) or less than that or greater escapes His Knowledge in the heavens or in the earth but it is in a Clear Book (Al-Lauh Al-Mahfuz).

(4) Say: (O Muhammad صلى الله عليه وسلم to polytheists, pagans) "Call upon those whom you assert (to be associate gods) besides Allah, they possess not even an atom's (or a small ant's) weight either in the heavens or on the earth, nor have they any share in either, nor there is for Him any supporter from among them.

(5) So whosoever does good equal to the weight of an atom (or a small ant) shall see it.

(6) And whosoever does evil equal to the weight of an atom (or a small ant) shall see it.