The word(s) "atom" appears 6 time(s) in 6 verse(s) in Quran in Abdullah Yusuf Ali translation.

(1) In whatever business thou mayest be, and whatever portion thou mayest be reciting from the Qur'an,- and whatever deed ye (mankind) may be doing,- We are witnesses thereof when ye are deeply engrossed therein. Nor is hidden from thy Lord (so much as) the weight of an atom on the earth or in heaven. And not the least and not the greatest of these things but are recorded in a clear record.

(2) The Unbelievers say, "Never to us will come the Hour": Say, "Nay! but most surely, by my Lord, it will come upon you;- by Him Who knows the unseen,- from Whom is not hidden the least little atom in the heavens or on earth: Nor is there anything less than that, or greater, but is in the Record Perspicuous:

(3) Say: "Call upon other (gods) whom ye fancy, besides Allah: They have no power,- not the weight of an atom,- in the heavens or on earth: No (sort of) share have they therein, nor is any of them a helper to Allah.

(4) And the mountains shall be crumbled to atoms,

(5) Then shall anyone who has done an atom's weight of good, see it!

(6) And anyone who has done an atom's weight of evil, shall see it.