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atomic number 81

 
Noun atomic number 81 has 1 sense
  1. thallium, Tl, 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
    --1 is a kind of metallic element, metal
    --1 is a substance of zinc blende, blende, sphalerite
atomic number 73 atomic number 74 atomic number 75 atomic number 76 atomic number 77 atomic number 78 atomic number 79 atomic number 80 atomic number 81 atomic number 82 atomic number 83 atomic number 84 atomic number 85 atomic number 86 atomic number 87 atomic number 88 atomic number 89

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