HII

hii H II H-II Translingual Alternative forms mul H-II H II HII Etymology mul H en hydrogen+mul II 2 Symbol mul symbol HII mul inorganic chemistry spectroscopy ionized hydrogen; an atomic hydrogen ion needing 1 electron to become neutral; a free hydrogen nucleus; a en hydron Synonyms H+ H1+ Hyponyms D+ D1+ T+ T1+ p proton Related terms mul HI<t:neutral atomic hydrogen> H<t:hydrogen> Descendants en HII emission line HII emission line H-II emission line H II emission line en HII region HII region H-II region H II region See also mul H2<t:dihydrogen, molecular hydrogen> H-2<t:deuterium> mul terms containing Roman numerals mul Chemical formulae Hydrogen