former chemist, yeah calling it an element is ok, though I would probably call it something like {0p,1u} H (with the stuff in brackets a superscript). The chem

former chemist, yeah calling it an element is ok, though I would probably call it something like {0p,1u} H (with the stuff in brackets a superscript). The chemical properties of muonium are likely to be "mostly the same" as hydrogen (for whatever that's worth). Similarly if you had a muon entrained in any other given nucleus, taking the place of a proton.