I use this to practice periodic trends after I lecture over them. I did not come up with this idea, but I am uploading the cards I made for the game in case you don't want to make your own. The cards are the main block elements plus one card that determines the trend to practice each round.
Students get in small groups and divide the deck of elements evenly amongst themselves. One person rolls a dice to determine the trend for the round.
1 = electronegativity
2 = ionization energy
3 = atomic radius
4 = m.p./b.p. (melting point or boiling point)
5 = electron affinity
6 = Your choice (meaning the student who rolled picks the trend)
Once the trend is determined, everyone flips the top card in their deck. Whoever has the highest electronegativity, biggest radius, etc. wins the round and takes the cards from that round and puts them at the bottom of their deck. Whoever collects all the cards, wins. I usually have my students play for about 20-30 minutes and then have them count their cards, declaring the student with the most cards in each group the winner.
You will want to make multiple decks in different colors so you can keep them separated easily. Lots of cutting, but if you laminate it, it should last for your teaching career.