Do Helium Atoms Decay in Complete Isolation?

[waitshift]

Thought experiment: If we had one kilogram of Helium in a nonpermeable box in the middle of the void between sol and our nearest Stellar neighbor and we left it there with no other interractions (all other things being equal) what happens to those electrons protons and neutrons ASSUMING no high energy particle interactions?
Will those atoms last until the end of the universe or will they... Decay?

 

[Nugatory]

Thought experiment: If we had one kilogram of Helium in a nonpermeable box in the middle of the void between sol and our nearest Stellar neighbor and we left it there with no other interractions (all other things being equal) what happens to those electrons protons and neutrons ASSUMING no high energy particle interactions?
Will those atoms last until the end of the universe or will they... Decay?

As far as we know, the helium atoms will remain stable forever.