Answers: I don't know but your question reminded me of a song by Tom Lehrer, "The Elements". I a short time ago looked it up and the three elements you list are adjectives on the same procession. Here's the link and the bit with your elements within it. It was funny when he did the song, he sing it very in a hurry.
http://www.lyricsfreak.com/t/tom+lehrer/...
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,
<gasp>
And cadmium and calcium and chromium and curium.
I guess I don't really infer having a slogan for three of the elements. Maybe you could affix some detail.
Praseodymium has adjectives six vowels in it, but that's no oblige, is it?
EDIT:
Here's a previous slogan for lead, kinda funny if you ask me
http://answers.yahoo.com/question/index?...
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