system
Given the following post, respond as if you're commenting on Reddit:
human
Why doesn’t anybody want to find more stable isotopes of existing elements?

With all the talk about discovering new elements, other elements are just left behind. Take astatine, for example. While it theoretically has a stable isotope, it’s still heavier than any isotope discovered or created. It’ll surely be easier to add more neutrons to astatine than try to make element 119 or 120. With the many, possibly unique properties of the those near the end of the periodic table, it seems like a no-brainer to try and look into those as well as discovering new ones.
gpt
We are very interested in discovering new elements, and new isotopes of already-discovered elements. And people are actively working on doing this in labs all over the world, every day.

However, it's unlikely that there are any yet undiscovered nuclides which will be stable.