![](http://www.alamy.com/thumbs/6/BD983CE8-0FA5-42E7-80D2-D9FD89ECA3B9/2C175MR.jpg)
Thallium symbol on chemical flask. Element number 81 of the Periodic Table of the Elements - Chemistry
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Photo credit: © Alejandro Miranda / Alamy / Afripics
License: Royalty Free
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