1
Hydrogen
Atomic Number1
Atomic Mass1.008 u
CategoryNonmetal
State at Room TempGas
Year Discovered1766
About Hydrogen
Lightest element. Makes up 75% of all normal matter by mass. Stars are mostly hydrogen fusing into helium. Named by Lavoisier from hydro (water) and genes (forming). Used in rocket fuel, ammonia production, and fuel cells. The only element whose isotopes have their own names: protium, deuterium, tritium.
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