If the protons and neutrons had, say, a hundred times more mass than they normally do, could the atom overall still be stable? Would it affect the atom's electron cloud somehow, or would it still be able to retain its chemical properties?
Additionally; if the nucleons gained this extra mass by being Kaluza-Klein states of protons and neutrons (meaning their constituents would still be the same kind and configuration of quarks, but only differ in mass due to their momentum in extra-dimensions), and not via interaction with the Higgs field, would it alter the way more massive nucleons would affect an atom?
This is meant to be an element alongside our known physical laws, so I'm not wondering how the universe would look like if this were the case since the Big Bang.
In short; What would happen if protons and neutrons were a hundred times heavier, but everything else kept its normal mass?