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A hint where you could actually place the new elements: You could put them in the island of stability. If some people expect half-lifes of millions of years, it's not much of a stretch to also put ...
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A hint where you could actually place the new elements: You could put them in the [island of stability](https://en.wikipedia.org/wiki/Stability_island). If some people expect half-lifes of millions of years, it's not much of a stretch to also put some stable element there (although a very long half-life may be good enough; after all, uranium is instable, and yet we even have quite a bit of naturally occurring uranium). If you want to be more future-proof, you can also put your elements in the second island of stability (see near the end of the Wikipedia article).