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atomic number 81 > noun, substance
MeaningA 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.
Synonymsthallium, Tl
Substance ofzinc blende, blende, sphalerite
Broadermetallic element, metal

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