Periodic Table
By <a href="//commons.wikimedia.org/wiki/User:Double_sharp" title="User:Double sharp">User:Double sharp</a>, based on <a href="//commons.wikimedia.org/wiki/File:Simple_Periodic_Table_Chart-en.svg" title="File:Simple Periodic Table Chart-en.svg">File:Simple Periodic Table Chart-en.svg</a> by <a href="//commons.wikimedia.org/wiki/User:Offnfopt" title="User:Offnfopt">User:Offnfopt</a> - <span class="int-own-work" lang="en">Own work</span>, CC BY-SA 4.0 , Link