Bond lengths and angles of different group 15 heterobenzenes (from left to right: <a href="https://en.wikipedia.org/wiki/en:Pyridine" class="extiw" title="w:en:Pyridine">pyridine</a>, <a href="https://en.wikipedia.org/wiki/en:Phosphabenzene" class="extiw" title="w:en:Phosphabenzene">phosphabenzene</a>, <a href="https://en.wikipedia.org/wiki/en:Arsabenzene" class="extiw" title="w:en:Arsabenzene">arsabenzene</a>, stilbabenzene, and bismabenzene)
<a href="//commons.wikimedia.org/wiki/User:Sponk" title="User:Sponk">Sponk</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Sponk" title="User talk:Sponk"><span class="signature-talk">talk</span></a>)
numerical values taken from Christoph Elschenbroich, <i>Organometallchemie</i>, 6th ed., 2008, Teubner, page 218 (<a rel="nofollow" class="external text" href="https://books.google.com/books?id=wtuuzCfNTCcC">Google Books</a>)