I was reading that hydrogen can become a metal in some cases, like in Jupiter, and the same for helium. Is this true for all non-metals?

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    $\begingroup$ Hydrogen is special because its the only member of its period and has a half-filled valence shell, so it can both lose or gain electrons. This is not the case with all non-metals. $\endgroup$ Sep 14, 2018 at 15:32
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    $\begingroup$ I think that it's generally believed that if one compresses any material enough that it will eventually turn into a metal because moving the atoms closer together tends to broaden the electronic bands, leading to possible band-overlap metallization and turning localized electrons into itinerant electrons. Don't know if there's any general proof of that, though. $\endgroup$
    – user93237
    Sep 14, 2018 at 16:54
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    $\begingroup$ Also, no, there's nothing special about hydrogen. The non-metallic elements oxygen, nitrogen, and xenon have all been metallized by the application of high pressures. $\endgroup$
    – user93237
    Sep 14, 2018 at 17:00
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    $\begingroup$ Try approaching this from the other side : here's a page with a List Of Elements that are Non-Metals. You also need a clear definition of "metal" to answer the question, which is a problem as it's a somewhat loose term. $\endgroup$ Sep 14, 2018 at 17:41


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