thallium -
a soft grey malleable metallic element that resembles tin but discolors on exposure to air; it is highly toxic and is used in rodent and insect poisons; occurs in zinc blende and some iron ores
metallic element,
metal any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
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Wiktionary
Substantiv
thallium -
A metallic chemical element symbol Tl with atomic number 81.
Wikipedia
Thallium is a chemical element with the symbol Tl and atomic number 81. This soft gray poor metal resembles tin but discolors when exposed to air. Approximately 60–70% of thallium production is used in the electronics industry, and the rest is used in the pharmaceutical industry and in glass manufacturing.
OmegaWiki Dictionary
Ω
thallium Bluish-white metal with tinlike malleability, but a little softer; used in alloys.
