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The most common polyatomic ions and acids.

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
Ammonium   NH4(+)  
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Cuprous   Cu (+)  
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Hydrogen   H (+)  
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Lithium   Li (+)  
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Potassium   K (+)  
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Mercurous   Hg2 (+) "occur in groups of two so total charge of the entire molecule is (2+)"  
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Sodium   Na (+)  
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Barium   Ba (+2)  
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Beryllium   Be (+2)  
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Cadmimum   Cd (+2)  
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Calcium   Ca (+2)  
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Cobalt(II)   Co (+2)  
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Chromium(II)   Cr (2+)  
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Cupric   Cu (+2)  
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Ferrous   Fe (+2)  
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Plumbous   Pb (+2)  
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Magnesium   Mg (+2)  
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Manganese   Mn (+2)  
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Mercuric   Hg (+2)  
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Nickel(II)   Ni (+2)  
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Strontium   Sr (+2)  
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Stannous   Sn (+2)  
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Zinc   Zn (+2)  
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Aluminum   Al (+3)  
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Chromium(III)   Cr (+3)  
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Antimony(III)   Sb (+3)  
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Bismuth   Bi (+3)  
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Ferric   Fe (+3)  
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Arsenic   As (+3)  
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Plumbic   Pb (+4)  
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Stannic   Sn (+4)  
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Carbon   C (+4)  
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Silicon   Si (+4)  
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Antimony(V)   Sb (+5)  
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Arsenic(V)   As (+5)  
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Bismuth(V)   Bi (+5)  
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Acetate   C2H3O2 (-1)  
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Bromate   BrO3 (-1)  
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Bromide   Br (-1)  
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Chlorate   ClO3 (-1)  
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Chlorite   ClO2 (-1)  
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Chloride   Cl (-1)  
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Cyanide   CN (-1)  
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Fluride   F (-1)  
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Hydride   H (-1)  
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Hydrogen Carbonate or Bicarbonate   HCO3 (-1)  
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Hydrogen Sulfate or Bisulfate   HSO4 (-1)  
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Hydrogen Sulfite or Bisulfite   HSO3 (-1)  
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hydroxide   OH (-1)  
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Hypochlorite   ClO (-1)  
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Hydrogen Sulfide   HS (-1)  
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Iodate   IO3 (-1)  
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Iodide   I (-1)  
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Nitrate   NO3 (-1)  
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Nitrite   NO2 (-1)  
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Perchlorate   ClO4 (-1)  
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Permanganate   MnO4 (-1)  
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Thiocynate   SCN (-1)  
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Carbonate   C03 (-2)  
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Chromate   CrO4 (-2)  
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Cyanamide   CN2 (-2)  
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Dichromate   CR2O7 (-2)  
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Hydrogen Phosphate   HPO4 (-2)  
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Oxalate   C2O4 (-2)  
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Oxide   O (-2)  
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Peroxide   O2 (-2)  
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Stannate   SnO3 (-2)  
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Stannite   SnO2 (-2)  
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Sulfate   SO4 (-2)  
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Sulfite   SO3 (-2)  
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Sulfide   S (-2)  
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Tartrate   C4H4O6 (-2)  
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Borate   BO3 (-3)  
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Hexacyanoferrate(III)or Ferricyanide   FE(CN)6 (-3)  
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Phosphate   PO4 (-3)  
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Phosphite   PO3 (-3)  
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Phosphide   P (-3)  
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Nitride   N (-3)  
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Hexacyanoferrate(II) or Ferrocynide   Fe(CN)6 (-4)  
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Silicate   SiO3 (-2)  
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Acetic   HC2H3O2  
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Carbonic   H2CO3  
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Hydrochloric   HCL  
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Hydrobromic   HBr  
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Hydrofluric   HF  
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Nitric   HNO3  
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Phosphoric   H3PO4  
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Sulfuric   H2SO4  
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Arsenate   AsO4 (-3)  
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Binoxalate   HC2O4 (-1)  
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Borite   BO2 (-3)  
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Bromite   BrO2 (-1)  
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Hexafluorosilicate   SiF6 (-2)  
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Iodite   IO2 (-1)  
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Monohydrogen Phosphate   HPO4 (-2)  
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Pyrophosphate   P2O7 (-4)  
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Selenate   SeO4 (-2)  
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