Thallium Periodic Table of Elements

walterericsy

Quezon City, Philippines

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Thallium is a chemical element with symbol Tl and atomic number 81. This soft gray post-transition metal is not found free in nature. When isolated, it resembles tin, but discolors when exposed to air. Chemists William Crookes and Claude-Auguste Lamy discovered thallium independently in 1861, in residues of sulfuric acid production. Both used the newly developed method of flame spectroscopy, in which thallium produces a notable green spectral line. Thallium, from Greek θαλλός, thallos, meaning “a green shoot or twig,” was named by Crookes. It was isolated by electrolysis a year later, by Lamy.

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