- #36
eric6s
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It seems to me that the lightest of all metals is solid Hydrogen, that is, when pressures are high enough, and temperatures are low enough as we see in the cores of gas giants Jupiter and Saturn. When pressures are low, and temperatures are high, all metals become a liquid, and then (in the extreme) a gas. The lightest solid metal at normal temperatures and pressures is certainly Lithium, but that's not what the question asks, is it?