Polyatomic Ions - group order
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| Hydride (Other Anions) | H -
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| Hydrogen carbonate (Acid Anions) | HCO3 -
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| Carbonate (Oxyanions) | CO3 2- (carbonic acid: H2CO3)
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| Permanganate (Oxyanions) | MnO4 -
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| Acetate (Oxyanions) | C2H3O2 -
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| Cyanide (Other Anions) | CN -
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| Thiocyanate (Other Anions) | SCN -
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| Group 1A/1: H Li Na K Rb Cs Fr | Group 1A has charge +1
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| Group 2A/2: Be Mg Ca Sr Ba Ra | Group 2A has charge +2
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| Diatomic Elements: H N O F Cl Br I | H2 N2 O2 F2 Cl2 Br2 I2
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| Nitrite (Oxyanions) | NO3 - (nitric acid: HNO3)
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| Nitrate (Oxyanions) | NO2 -
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| Group 5A top down: N, P | Nitrogen, Phosphorus
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| Nitride (Group 5A/15) | N3 -
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| Group 5A/15 charge? | -3
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| Phospate (Oxyanions) | PO4 3- (phosphoric acid:H3PO4)
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| Phosphide (Group 5A/15) | P 3-
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| Hydrogen phosphate (Acid Anions) | HPO4 2-
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| Dihydrogen phosphate (Acid Anions) | H2PO4 -
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| Group 5A/15 charge? | -3
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| Hydroxide (Oxyanions) | OH -
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| Peroxide (Diatomic Elemental) | O2 2-
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| Oxide (Group 6A/16) | O2 -
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| Chromate | CrO4 2-
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| Dichromate | Cr2O7 2-
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| Sulfate (Oxyanions) | SO4 2- (sulfuric acid: H2SO4)
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| Sulfide (Group 6A/16) | S 2-
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| Sulfite (Oxyanions) | SO3 2-
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| Group 6A charge? | -2
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| 6A top down: O, S, Se | Oxygen, Sulfur, Selenium
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| Hydrogen sulfate (Acid Anions) | HSO4 -
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| Hydrogen sulfite (Acid Anions) | HSO3 -
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| Hydrogen sulfide (Acid Anions) | HS -
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| 6A top down: O, S, Se | Oxygen, Sulfur, Selenium
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| Group 6A charge? | -2
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| Perchlorate (Oxyanions) | ClO4 -
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| Chlorate (Oxyanions) | ClO3 - (chloric acid: HClO3)
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| Chlorite (Oxyanions) | ClO2 -
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| Hypochlorite (Oxyanions) | ClO -
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| Chloride (Halogen group 7A/17) | Cl-
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| Bromate (Oxyanions) | BrO3 -
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| Bromite (Oxyanions) | BrO2 -
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| Hypobromite (Oxyanions) | BrO -
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| Bromide (Halogen group 7A/17) | Br -
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| Group 7A/17 charge? | -1
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| Periodate (Oxyanions) | IO4 -
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| Iodate (Oxyanions) | IO3 -
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| Iodide (Halogen group 7A/17) | I-
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| Fluoride (Halogen group 7A/17) | F-
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| Group 7A/17 top down: F, Cl, Br, I | Fluorine, Chlorine, Bromine, Iodine
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