This bingo card has a free space and 57 words: Mg 2+, NH4 +, H +, Li +, K +, Ag +, Na +, Ba 2+, Ca 2+, Co 2+, Cu 2+, Fe 2+, Mn 2+, Ni 2+, Sr 2+, Zn 2+, Al 3+, Cr 3+, Br -, Cl -, CN -, CH3COO -, F -, HCO3 -, OH -, I -, NO3 -, MnO4 -, CO3 2-, Cr2O7 2-, O 2-, SO4 2-, S 2-, PO4 3-, Cd 2+, Be 2+, ClO3 -, Cu +, Hg 2+, Hg +, Fe 3+, N 3-, Co 3+, Mn 3+, P 3-, Sn +2, Sn 4+, Pb 4+, Pb 2+, NO2 -, ClO2 -, ClO -, ClO4 -, SO3 2-, PO3 3-, HSO4 - and SiO3 2-.
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With players vying for a you'll have to call about __ items before someone wins. There's a __% chance that a lucky player would win after calling __ items.
Tip: If you want your game to last longer (on average), add more unique words/images to it.