1) Explosive chemical
Found on
https://www.crosswordclues.com/clue/pentazenium
The pentazenium cation (also known as pentanitrogen) is a positively charged polynitrogen ion of the chemical formula {chem|N|5|+}. Together with dinitrogen and the azide anion, it is one of the only three polynitrogen species obtained in bulk quantities. ==History== Within the High Energy Density Matter research program, run by the U.S. Air Force...
Found on
http://en.wikipedia.org/wiki/Pentazenium
No exact match found.
