Every time I try and go threw the portal to Atum my game crashes I also won't show a crash report. I do have other mods installed but I'm 90% sure they are all working correctly and its atum that is crashing the game. plz fix this so I can actually go to the atom dimension I play on 1.16.5 if your wondering

Without a crash report we can't know why it's crashing.

With just the Atum and Curios installed, the game doesn't crash

someone else on curse forge also has the same issue. I will try and see if it still crashes with just atum and curios. if it works ill close this issue if it dosent I can send a crash report if there is one

so I tried atum and curios on its own and it still crashes when I try and go to the atum dimension. it isn't generating a crash report it just says this: error game crashed an unexpected issue occurred and the game has crashed we are sorry for the inconvenience exit code 0.

Can you post you latest.log file.

how do I find the log file is in the Minecraft folder?

The easiest way to get to the folder is to open the resources folder in-game and go up one folder. It will take you to the ".minecraft" folder of that instance. The file you are looking for is in the "/logs" folder.

Unable to reproduce with latest version of Atum, Curios & Forge, through the CurseForge launcher.
With the information you´ve provided, there is no way to replicate the issue, and therefor there is no way for me to even start to attempt to fix it.