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atomic number 67
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atomic number 80
-- atomic number 81 --
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atomic number 81

Noun1.atomic number 81 - a soft gray 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
Synonyms: thallium, Tl
blende, metal, metallic element, sphalerite, thallium, Tl, zinc blende

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