I wrote a year ago about Chemistry Trumps, a set of playing cards from England that allowed you to have fun while learning about the periodic table of elements. My only complaint was that there were only 28 cards.
Never fear, American Science and Surplus has found double decks of Elemental Cards. Like Chemistry Trumps, the cards are printed with boiling point, melting point, atomic number, (approximate) atomic weight, series, standard state and abbreviation. Unlike Chemistry Trumps, they are also printed with the standard suits and numbers of regular playing cards. There are two decks, so 104 elements are represented instead of only 28.
What we did this morning was load the element cards into our UNO Attack card shooter. Oh, so much fun! The rules are still evolving, but we've decided cards can be matched by elemental series (transition metal, lanthanide, halogen, noble gas, etc.) or by suit (hearts, spades, clubs or diamonds). Radioactive elements can also be matched to each other. We tried matching by standard state, but there were too many solids.
If chemistry is not your thing, I'd still recommend UNO Attack as the best way to play UNO. :D