Illustrative diagram of beta-fluorine
<a href="//commons.wikimedia.org/wiki/User:Begoon" title="User:Begoon">Begoon</a>
<span class="int-own-work" lang="en">Own work</span>, based on <a rel="nofollow" class="external autonumber" href="http://www.benjamin-mills.com/Wikipedia/beta-fluorine-unit-cell-Pauling-1970.png">[1]</a>