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Thallium is a silvery-white metal element that doesn't occur naturally in pure form and was discovered in 1861 when chemists detected its distinctive green spectral line in sulfuric acid production residues. The element's name comes from its characteristic green color, and while it resembles tin in appearance, it tarnishes when exposed to air.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).