Periodic table of the chemical elements
<a href="//commons.wikimedia.org/w/index.php?title=User:Cepheus&amp;action=edit&amp;redlink=1" class="new" title="User:Cepheus (page does not exist)">Cepheus</a>
2007-02-26
Own work based on: <a href="https://en.wikipedia.org/wiki/Periodic_table" class="extiw" title="w:Periodic table">Periodic table</a> article on Wikipedia