Hydrogen: nm Hydrogen is the lightest and simplest atomic element (H; n° at. 1; m. at. 1,00794), flammable, colorless and odorless gas in the uncombined state (dihydrogen) .The hydrogen atom is made up of a proton and an electron. Hydrogen (H2) molecule. Heavy hydrogen (deuterium).Radioactive hydrogen (tritium).Phosphorus hydrogen (phosphine), hydrogen sulfide.Hydrogen peroxide: hydrogen peroxide.Hydrogen bomb or H bomb.Hydrogen enters into the composition of water ...
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