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Noun: Tl
  1. A soft grey malleable metallic element that resembles tin but discolours on exposure to air; it is highly toxic and is used in rodent and insect poisons; occurs in zinc blende and some iron ores
    - thallium, atomic number 81

Type of: metal, metallic element

Part of: blende, sphalerite, zinc blende

Encyclopedia: Tl

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