THALLIUM

Thallium

Thallium is a chemical element with symbol Tl and atomic number 81. This soft gray poor 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,, meaning "a green shoot or twig," was named by Crookes. It was isolated by electrolysis a year later, by Lamy.

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thallium

Noun

  1. A metallic chemical element (symbol Tl) with atomic number 81.


The above text is a snippet from Wiktionary: thallium
and as such is available under the Creative Commons Attribution/Share-Alike License.

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