Pacer Chemistry

In March 2000, there was a thread of messages on the AMC Pacer list about chemical compounds whose symbols spell out the word "Pacer", and it was just too much fun to not include as a Pacer Page feature!

First, Jesse posted:

"On a recent chemistry test, the extra credit question was to make a word combining elements, so I took it upon myself to make it say 'Pacer'. SUCCESS! I have no idea what to call my new covalent compound, but I'd like someone to come up with the actual name for it (e.g. carobon monoxide, not carbon oxygen).
    Phosphorous Actinium Erbium
    PAcEr "See?"

Then Leon Doneski, chemistry student at the University of Delaware, made a slight correction:

"The chemical nomenclature for the 'compound' that spells the word 'PAcEr' would be phosphorous actinium erbiumide. Since the charge on P is -3, and Ac and Er are each +3, this mythical compound would technically be written as P2AcEr."

Leon later added:

"Realize that I'm an analytical chemist, and inorganic is not my specialty...to continue the thread Jesse started, there's another mythical 'chemical compound' that spells Pacer:
    Pa C Er : protactinium carbon erbium
"Of course, if someone could synthesize this, it would have the formula (Pa)7 (CEr)5."