. "atomic number 81"@en-us . . "thallium"^^ . "0"^^ . . . "0.125"^^ . . "114657818"^^ . "0.125"^^ . "0.125"^^ . . "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"@en-us . "0.125"^^ . . "thallium"@en-us . "Tl"@en-us . "0.125"^^ . "0.125"^^ . . "0.125"^^ . . . "0.125"^^ . . . "0"^^ . . . . "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"@en-us . "14657818-n"^^ . . "113818772"@en-us . .