A little birdie told me you could make a custom set and put it in periodic table, then look at how Mendeleev renders text onto the tooltip and do the same... :)
Basically just make a custom version of Mendy that only displays the data you want.
You make it sound so easy! ;)
But I'll look at Mendeleev and Periodic Table and see if I can figure something out.
If anyone else have some thoughts/ideas bring em on! ;)