Chemical element made with alternative particles

In my earlier question, regarding airships, I mentioned fictional gas, as light as hydrogen but non-flammable. Is it possible to make chemical element, with atoms made not from nucleons, but with some exotic particles, thus creating elements with densities and atomic masses same as "normal" elements, but with diferrent properties? Are there any particles other than nucleons in existence, that are stable enough to do that?

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Chemical element made with alternative particles

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