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Q: How does hydrogen turn into a metal? A: Hang on a second, I need to train my AI supercomputer first

Charlie Clark Silver badge

Hydrogen is just odd and largely defies classification along with the other elements. It's an electron captured by a proton so it doesn't even have a proper nucleus except it has two isotopes that do. But it's metallic behaviour has been absorbed in many ways, not just because it's such an effective reduction agent but also because it can be adsorbed.

Cool H and He enough and they get odder.

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