The Lewis structure of a carbon atom
K!roman, SVG: <a href="https://de.wikipedia.org/wiki/Benutzer:Marlus_Gancher" class="extiw" title="de:Benutzer:Marlus Gancher">Marlus_Gancher</a>
drawn based on <a href="//commons.wikimedia.org/wiki/File:Carbone_lewis.png" title="File:Carbone lewis.png">File:Carbone lewis.png</a> (bitmap version)