17 of them

Quiz yourself by guessing what should be in each of the black rectangles below before clicking on it to display the answer.
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Name
Formula
Charge
Ammonium  NH4  +1  
Acetate  CH3CO2  -1  
Carbonate  CO3  -2  
Hydrogen Carbonate (bicarbonate)  HCO3  -1  
Cyanide  CN  -1  
Hydroxide  OH  -1  
Hypochlorite  OCl  -1  
Nitrate  NO3  -1  
Nitrite  NO2  -1  
Permanganate  MnO4  -1  
Phosphate  PO4  -3  
Hydrogen phosphate  HPO4  -2  
Dihydrogen phosphate  H2PO4  -1  
Sulfate  SO4  -2  
Sulfite  SO3  -2  
Hydrogen Sulfate  HSO4  -1  
Dichromate  Cr2O7  -2  


   

 
 

 
 

 
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