How to say atomic number 81 ?

Atomic number 81

[əˈtɑmɪk ˈnʌmbər 81]

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What is the definition of atomic number 81 ?

  1. 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
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