Search Result：atomic number 81
atomic number 81 
(TTS Sound)
(TTS Sound)Overview of noun atomic_number_81
The noun atomic number 81 has 1 sense
- thallium, Tl, atomic number 81 -- (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)