noun🔗ShareThe lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.00794."Hydrogen is the simplest chemical element, with only one proton in its atom. "elementsubstancechemistryphysicssciencematerialChat with AIVocabulary GamePractice Reading
noun🔗ShareMolecular hydrogen (H2), a colourless, odourless and flammable gas at room temperature."The scientist carefully collected the hydrogen gas in the lab. "elementsubstancechemistrymaterialfuelenergyscienceChat with AIVocabulary GamePractice Reading
noun🔗ShareAn atom of the element."The scientist studied the hydrogen atom in detail. "elementchemistrysubstancescienceChat with AIVocabulary GamePractice Reading
noun🔗ShareA sample of the element."The science experiment required a small hydrogen sample for the demonstration. "elementsubstancechemistryChat with AIVocabulary GamePractice Reading
