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: Hydrogen is highly combustible, burning with a pale blue, nearly invisible flame to produce water vapor as its only byproduct.
: It is the least dense element, roughly 14 times lighter than air. hidrogen
, identified by the chemical symbol H , is the lightest, simplest, and most abundant element in the universe, making up approximately 75% of all baryonic mass. On Earth, it rarely exists in its pure gaseous form (H₂) due to its low density and high reactivity; instead, it is primarily found in chemical compounds such as water (H₂O) and organic matter like hydrocarbons. : Hydrogen is highly combustible, burning with a