"I, Ron Martindale, won't lead you far astray. / My neighbors mar my golden years every single day. / My neighbor on the right side - for a nickel he'd betray me. / And Brad on my left, he's gone on and on 'bout how he owes me but won't pay me!" / The answer to this riddle may delight some chemistry nerds, / For eight examples of this thing are hidden in those words.