I don’t know but your question reminded me of a song by Tom Lehrer, “The Elements”. I just looked it up and the three elements you list are all on the same line. Here’s the link and the part with your elements in it. It was funny when he did the song, he sang it very fast.

http://www.lyricsfreak.com/t/tom+lehrer/the+elements_20138388.html

There’s holmium and helium and hafnium and erbium,

And phosphorus and francium and fluorine and terbium,

And manganese and mercury, molybdenum, magnesium,

Dysprosium and scandium and cerium and cesium.

And lead, praseodymium, and platinum, plutonium,

Palladium, promethium, potassium, polonium,

And tantalum, technetium, titanium, tellurium,

And cadmium and calcium and chromium and curium.

I guess I don’t really understand having a slogan for three of the elements. Maybe you could add some detail.

Praseodymium has all six vowels in it, but that’s no help, is it?

EDIT:

Here’s a previous slogan for lead, kinda funny if you ask me

http://answers.yahoo.com/question/index?qid=20061008111010AAARZE2

Democrats: in line with probability we would desire to continually get Ted Turner to be an envoy as he believes, quote: “The hijackers (9/11) have been motivated via international poverty and have been brave no longer less than.” Ted additionally pronounced, “the clarification the commerce center have been given hit is with the help of the fact there are various people residing in abject poverty available who haven’t any wish for a larger existence.” This stated for the duration of a speech at Brown college, windfall, RI on Feb. 11, 2002 He as quickly as pronounced, usa “has a number of the dumbest people in the international!” they do no longer choose slogans with people like Ted Turner of their corner, Ha!