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  4700gbera <4700gbera@um*.cc*.um*.ed*> wrote on Tue 27 Sep 1994 09:01:44
EDT (Subject: Helium compounds):-

 > I'm working on memory here (always dangerous), but I get "Science News"
(all the science that fits, we print!), and I **think** I remember reading
that a couple-few years ago, someone managed to synthesize a helium compound.
I have no idea why.

  There are 3 sorts of helium / neon / argon "compound":-
  (1) Clathrates. The noble gas atoms are physically trapped among some other
substance.
  (2) Unstable transient molecules such as HeH and the ion He2+. (These two
have a 3-electron bond.) If you can find that helium compound reference,
please send full reference details about it to me.
  (3) I suppose that if you squeeze noble gas so hard that the outermost
electronic shell collapses from the pressure, it will go metallic, same as
hydrogen will under very high pressure.

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