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thumb|Iron(II) chloride tetrahydrate, .
thumb|Iron(II) chloride tetrahydrate, .
In chemistry, iron(II) refers to the element iron in its +2 oxidation state. The adjective ferrous or the prefix ferro- is often used to specify such compounds, as in ferrous chloride for iron(II) chloride (). The adjective ferric is used instead for iron(III) salts, containing the cation Fe3+. The word ferrous is derived from the Latin word , meaning "iron".
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).