This is a set of 40 Chemistry Bingo Cards + a Legend to help you keep track of what you've called.
I've used this a lot over the years and it's organized as follows: I only had covalent molecules listed in the "C" column, and only simple ionic in the "H" column, ionic with Transition Metals requiring Roman Numerals in the "E" column and ionic with common polyatomics in the "M" columns (with acids also int he "M column") and mix of the above in the "O" column).
Each student card (of which there are 40) consists of 4 playable 5x5 names, so that there is plenty for the student to pay attention to. I usually print these on harder/construction paper and then laminate and let students use dry erase markers.
Usually I call out the chemical name and if/when a student gets a "bingo/chem-o" I have them say the column, the chemical name and the correct formula. If they mess up at all (for example, they say think WO3 was tungsten trioxide), it no longer counts as a bingo. This usually ensures that students are paying attention and writing down names and formulas as we go.
I've used this predominantly for high school review, but you could always give them the name AND the formula of some of the harder ones if you wanted to adapt (and also enrich a little).