Pnicogen. Silent “p” or sounded? The Oxford English Dictionary (OED) people just contacted me, wanting a definitive answer.
Partly because they found my Molecule of the Month on the subject at Paul May’s excellent site and suspected I was some kind of expert. Sadly I’m not, so I’ve resorted to asking a couple of contacts who might actually have a clue. I’d like it to be p’nuh but suspect the p should be silent, as in pneumatic. However, the OED entry currently claims otherwise, and my first contact agrees that it should be “p’ni”