Lightest known substance
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AnswerCrossword Clue
HYDROGENLightest known substance
HYDROGENLightest of all known substances.
HYDROGENThe lightest of all known substances.
LITHIAOxide of the lightest known metal.
METALLithium is the lightest one known
lithiuma soft silver-white element of the alkali metal group that is the lightest metal known and that is used especially in alloys and glass, in chemical synthesis, and in storage batteries see element table