Splitting the atom? I presume you mean the claim that Sura 34:3 refer to this?
"Those who disbelieve say: The Hour will never come unto us. Say: Nay, by my Lord, but it is coming unto you surely. He is the Knower of the Unseen, Whom not an atom's weight eludes, either in the heavens or in the earth; nor is there anything smaller or larger than that which is not in a Clear Book."
This seems to be saying, "Unbelievers claim Allah's judgement will never happen, but, bad luck loser, it is because Allah knows everything - even the weight of an atom - and all matters, whether smaller or greater than this issue - are known to him."
The notion of atoms was, of course, Greek. The idea that this verse refers to the splitting of the atom seems entirely fanciful to me. Perhaps the original language has something that is wholly missing from the translation.
There's a similar phrase in Sura 10:61, again not referring to splitting an atom. Indeed, some translations refer to an ant not an atom, nor did English translations use the word 'atom' prior to the 20th century.
It's a real shame that these books (yours, the Bibble) cannot unambigiously describe a single genuine scientific advance except in the light of poetic interpretation after the fact, isn't it?
Your go.