system
Given the following post, respond as if you're commenting on Reddit:
human
Is there a boundary between elements that must exist and those that cant? I.e. what happens if you keep adding protons?

Asking for an 11 year old. We accept of course that these higher elements won't be stable.
gpt
If you keep adding protons at a fixed number of neutrons, you’ll reach a point where the last proton simply doesn’t bind to the rest of the nucleus. If you try to add another proton, it just “drips” back out. We call this the *proton dripline*.