hydrogen

== English == === Alternative forms === hydrogenium (obsolete) === Etymology === From French hydrogène, coined by Louis-Bernard Guyton de Morveau and Antoine Lavoisier, from Ancient Greek ὕδωρ (húdōr, “water”) + γεννάω (gennáō, “I bring forth”). Corresponding to hydro- +‎ -gen. === Pronunciation === (Received Pronunciation) IPA(key): /ˈhaɪdɹəd͡ʒən/ (General American) enPR: hī'drəjən, IPA(key): /ˈhaɪdɹəd͡ʒən/, [ˈhaɪdɹəd͡ʒən], (sometimes) [ˈhaɪd͡ʒɹəd͡ʒən] Hyphenation: hy‧dro‧gen === Noun === hydrogen (countable and uncountable, plural hydrogens) The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.008. Alternative form: H (symbol) For more quotations using this term, see Citations:hydrogen. An atom of this element. Molecular hydrogen (H2), a colourless, odourless and flammable gas at room temperature. A molecule of this molecular species. The isotope hydrogen-1 (protium) (symbol H or 1H), contrasting with deuterium and tritium. Hydrogen is generally considered to be electronically the same as deuterium. […] In both PdHx and PdDx […] a resistivity maximum is found near 50 K. A sample of the element or molecule. ==== Synonyms ==== ==== Hyponyms ==== ==== Derived terms ==== ==== Related terms ==== ==== Descendants ==== → Burmese: ဟိုက်ဒရိုဂျင် (huikda.ruigyang) ==== Translations ==== ==== See also ==== === References === Hydrogen on the British Royal Society of Chemistry's online periodic table === Further reading === hydrogen on Wikipedia.Wikipedia == Danish == === Etymology === From French hydrogène. === Noun === hydrogen n (singular definite hydrogenet, not used in plural form) hydrogen Synonym: brint ==== Declension ==== === References === “hydrogen” in Den Danske Ordbog == Norwegian Bokmål == === Noun === hydrogen n (definite singular hydrogenet) (uncountable) hydrogen (chemical element, symbol H) ==== Derived terms ==== == Norwegian Nynorsk == === Noun === hydrogen n (definite singular hydrogenet) (uncountable) hydrogen (chemical element, symbol H) ==== Derived terms ==== == Welsh == === Etymology === Borrowed from English hydrogen, from French hydrogène, from Ancient Greek ὕδωρ (húdōr, “water”) + γεννάω (gennáō, “I bring forth”). === Pronunciation === (North Wales) IPA(key): /ˈhədrɔˌɡɛn/, /ˈhɨ̞drɔˌɡɛn/ (South Wales) IPA(key): /ˈhədrɔˌɡɛn/, /ˈhɪdrɔˌɡɛn/ Rhymes: -ədrɔɡɛn, -ɨ̞drɔɡɛn === Noun === hydrogen m (uncountable, not mutable) hydrogen Synonyms: ulai, ulnwy ==== Derived terms ==== === Further reading === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “hydrogen”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies