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Common Ions - All
All anions, cations, and polyatomic ions you need to know for Chemistry. NOTE: Ions with multiple + or - charges are indicated by numbers in parentheses after the formula or symbol. Single positive or negative charges are appended to the symbol or formula. e.g. Na+ or Cl- vs SO4(2-) or CO3(2-)
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| A | B |
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| H+ | hydrogen ion |
| H¯ | hydride |
| Li+ | lithium ion |
| F¯ | fluoride |
| Na+ | sodium ion |
| Cl¯ | chloride |
| K+ | potassium ion |
| Br¯ | bromide |
| Rb+ | rubidium ion |
| I ¯ | iodide |
| Cs+ | cesium ion |
| O(2¯) | oxide |
| Be(2+) | beryllium ion |
| S(2¯) | sulfide |
| Mg(2+) | magnesium ion |
| Se(2¯) | selenide |
| Ca(2+) | calcium ion |
| Te(2¯) | telluride |
| Sr(2+) | strontium ion |
| Ba(2+) | barium ion |
| Ag+ | silver ion |
| N(3¯) | nitride |
| Ra(2+) | radium ion |
| Ni(2+) | nickel ion |
| P(3¯) | phosphide |
| Zn(2+) | zinc ion |
| Al(3+) | aluminum ion |
| As(3¯) | arsenide |
| Cu+ | copper(I) cuprous |
| Hg2(2+) | mercury(I) mercurous |
| Cu(2+) | copper(II) cupric |
| Hg(2+) | mercury(II) mercuric |
| Fe(2+) | iron(II) ferrous |
| Pb(2+) | lead(II) plumbous |
| Fe(3+) | iron(III) ferric |
| Pb(4+) | lead(IV) plumbic |
| Sn(2+) | tin(II) stannous |
| Co(2+) | cobalt(II) cobaltous |
| Sn(4+) | tin(IV) stannic |
| Co(3+) | cobalt(III) cobaltic |
| Cr(2+) | chromium(II) chromous |
| Au+ | gold(I) aurous |
| Cr(3+) | chromium(III) chromic |
| Au(3+) | gold(III) auric |
| Mn(2+) | manganese(II) manganous |
| Mn(3+) | manganese(III) manganic |
| NO3¯ | nitrate |
| ClO4¯ | perchlorate |
| NO2¯ | nitrite |
| ClO3¯ | chlorate |
| CrO4(2¯) | chromate |
| ClO2¯ | chlorite |
| Cr2O7(2¯) | dichromate |
| ClO¯ | hypochlorite |
| CN¯ | cyanide |
| IO4¯ | periodate |
| MnO4¯ | permanganate |
| IO3¯ | iodate |
| OH¯ | hydroxide |
| IO¯ | hypoiodite |
| O2(2¯) | peroxide |
| BrO3¯ | bromate |
| NH2¯ | amide |
| BrO¯ | hypobromite |
| CO3(2¯) | carbonate |
| HCO3¯ | hydrogen carbonate (bicarbonate) |
| SO4(2¯) | sulfate |
| HSO4¯ | hydrogen sulfate (bisulfate) |
| SO3(2¯) | sulfite |
| HSO3¯ | hydrogen sulfite (bisulfite) |
| C2O4(2¯) | oxalate |
| HC2O4¯ | hydrogen oxalate (binoxalate) |
| PO4(3¯) | phosphate |
| HPO4(2¯) | hydrogen phosphate |
| PO3(3¯) | phosphite |
| H2PO4¯ | dihydrogen phosphate |
| S2O3(2¯) | thiosulfate |
| HS¯ | hydrogen sulfide |
| AsO4(3¯) | arsenate |
| BO3(3¯) | borate |
| SeO42¯ | selenate |
| B4O72¯ | tetraborate |
| SiO32¯ | silicate |
| SiF62¯ | hexafluorosilicate |
| C4H4O62¯ | tartrate |
| C2H3O2¯ or (CH3COO¯) | acetate |
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Chemistry |
Bellows Falls Union High School |
| Proctorsville, VT |
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