![](http://www.alamy.com/thumbs/6/2B01C032-EAD6-40C3-8163-2838C3222C89/E09Y18.jpg)
Isolated blackboard with periodic table Thallium Chemistry
Size: 5184px × 3456px
Photo credit: © Micha Klootwijk / Alamy / Afripics
License: Royalty Free
Model Released: No
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