page_title: Thallium
section_title: Chemical properties
hierarchical_section_title: Thallium / Properties / Chemical properties
caption_attribution_description: English: Heavily corroded thallium metal rod. Length ca. 5cm. Image taken by User:Dschwen on January 5th 2006.
context_page_description: Thallium is a chemical element. It has the chemical symbol Tl. It has the atomic number 81. Its standard atomic weight is 204.4. It is found in Group 15 of the periodic table. Thallium is a gray metal that is very toxic.
context_section_description: Thallium is a moderately reactive metal. It corrodes easily in air with a blue-gray color that is similar to lead. If it is kept in air for a long time, a large amount of thallium(I) oxide will build up. It corrodes in the presence of water to make the hydroxide. It burns with a greenish flame. It reacts with most acids.
caption: A corroded thallium rod
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