Ionic Charges Chart
Use this chart to check common element ion charges before writing ionic compound formulas.
| Element | Symbol | Common charge | Common ions | Example compounds |
|---|---|---|---|---|
| Hydrogen | H | +1, -1 | H+, H- | HCl, H2O |
| Helium | He | none listed | none listed | context-dependent |
| Lithium | Li | +1 | Li+ | LiCl, Li2O |
| Beryllium | Be | +2 | Be2+ | BeCl2, BeO |
| Boron | B | +3 | B3+ | BCl3, B2O3 |
| Carbon | C | -4, +4 | C4-, C4+ | Na4C, CaC2 |
| Nitrogen | N | -3, +3, +5 | N3-, N3+, N5+ | Na3N, CaN2 |
| Oxygen | O | -2 | O2- | Na2O, CaO |
| Fluorine | F | -1 | F- | NaF, CaF2 |
| Neon | Ne | none listed | none listed | context-dependent |
| Sodium | Na | +1 | Na+ | NaCl, Na2O |
| Magnesium | Mg | +2 | Mg2+ | MgCl2, MgO |
| Aluminum | Al | +3 | Al3+ | AlCl3, Al2O3 |
| Silicon | Si | -4, +4 | Si4-, Si4+ | Na4Si, CaSi2 |
| Phosphorus | P | -3, +3, +5 | P3-, P3+, P5+ | Na3P, CaP2 |
| Sulfur | S | -2, +4, +6 | S2-, S4+, S6+ | Na2S, CaS |
| Chlorine | Cl | -1, +1, +5, +7 | Cl-, Cl+, Cl5+, Cl7+ | NaCl, CaCl2 |
| Argon | Ar | none listed | none listed | context-dependent |
| Potassium | K | +1 | K+ | KCl, K2O |
| Calcium | Ca | +2 | Ca2+ | CaCl2, CaO |
| Scandium | Sc | +3 | Sc3+ | ScCl3, Sc2O3 |
| Titanium | Ti | +3, +4 | Ti3+, Ti4+ | TiCl3, Ti2O3 |
| Vanadium | V | +2, +3, +4, +5 | V2+, V3+, V4+, V5+ | VCl2, VO |
| Chromium | Cr | +2, +3, +6 | Cr2+, Cr3+, Cr6+ | CrCl2, CrO |
| Manganese | Mn | +2, +4, +7 | Mn2+, Mn4+, Mn7+ | MnCl2, MnO |
| Iron | Fe | +2, +3 | Fe2+, Fe3+ | FeCl2, FeO |
| Cobalt | Co | +2, +3 | Co2+, Co3+ | CoCl2, CoO |
| Nickel | Ni | +2, +3 | Ni2+, Ni3+ | NiCl2, NiO |
| Copper | Cu | +1, +2 | Cu+, Cu2+ | CuCl, Cu2O |
| Zinc | Zn | +2 | Zn2+ | ZnCl2, ZnO |
| Gallium | Ga | +3 | Ga3+ | GaCl3, Ga2O3 |
| Germanium | Ge | +2, +4 | Ge2+, Ge4+ | GeCl2, GeO |
| Arsenic | As | -3, +3, +5 | As3-, As3+, As5+ | Na3As, CaAs2 |
| Selenium | Se | -2, +4, +6 | Se2-, Se4+, Se6+ | Na2Se, CaSe |
| Bromine | Br | -1, +1, +5 | Br-, Br+, Br5+ | NaBr, CaBr2 |
| Krypton | Kr | none listed | none listed | context-dependent |
| Rubidium | Rb | +1 | Rb+ | RbCl, Rb2O |
| Strontium | Sr | +2 | Sr2+ | SrCl2, SrO |
| Yttrium | Y | +3 | Y3+ | YCl3, Y2O3 |
| Zirconium | Zr | +4 | Zr4+ | ZrCl4, Zr2O3 |
| Niobium | Nb | +3, +5 | Nb3+, Nb5+ | NbCl3, Nb2O3 |
| Molybdenum | Mo | +4, +6 | Mo4+, Mo6+ | MoCl4, Mo2O3 |
| Technetium | Tc | +4, +7 | Tc4+, Tc7+ | TcCl4, Tc2O3 |
| Ruthenium | Ru | +3, +4 | Ru3+, Ru4+ | RuCl3, Ru2O3 |
| Rhodium | Rh | +3 | Rh3+ | RhCl3, Rh2O3 |
| Palladium | Pd | +2, +4 | Pd2+, Pd4+ | PdCl2, PdO |
| Silver | Ag | +1 | Ag+ | AgCl, Ag2O |
| Cadmium | Cd | +2 | Cd2+ | CdCl2, CdO |
| Indium | In | +1, +3 | In+, In3+ | InCl, In2O |
| Tin | Sn | +2, +4 | Sn2+, Sn4+ | SnCl2, SnO |
| Antimony | Sb | -3, +3, +5 | Sb3-, Sb3+, Sb5+ | Na3Sb, CaSb2 |
| Tellurium | Te | -2, +4, +6 | Te2-, Te4+, Te6+ | Na2Te, CaTe |
| Iodine | I | -1, +1, +5, +7 | I-, I+, I5+, I7+ | NaI, CaI2 |
| Xenon | Xe | none listed | none listed | context-dependent |
| Cesium | Cs | +1 | Cs+ | CsCl, Cs2O |
| Barium | Ba | +2 | Ba2+ | BaCl2, BaO |
| Lanthanum | La | +3 | La3+ | LaCl3, La2O3 |
| Cerium | Ce | +3, +4 | Ce3+, Ce4+ | CeCl3, Ce2O3 |
| Praseodymium | Pr | +3, +4 | Pr3+, Pr4+ | PrCl3, Pr2O3 |
| Neodymium | Nd | +3 | Nd3+ | NdCl3, Nd2O3 |
| Promethium | Pm | +3 | Pm3+ | PmCl3, Pm2O3 |
| Samarium | Sm | +2, +3 | Sm2+, Sm3+ | SmCl2, SmO |
| Europium | Eu | +2, +3 | Eu2+, Eu3+ | EuCl2, EuO |
| Gadolinium | Gd | +3 | Gd3+ | GdCl3, Gd2O3 |
| Terbium | Tb | +3, +4 | Tb3+, Tb4+ | TbCl3, Tb2O3 |
| Dysprosium | Dy | +3 | Dy3+ | DyCl3, Dy2O3 |
| Holmium | Ho | +3 | Ho3+ | HoCl3, Ho2O3 |
| Erbium | Er | +3 | Er3+ | ErCl3, Er2O3 |
| Thulium | Tm | +3 | Tm3+ | TmCl3, Tm2O3 |
| Ytterbium | Yb | +2, +3 | Yb2+, Yb3+ | YbCl2, YbO |
| Lutetium | Lu | +3 | Lu3+ | LuCl3, Lu2O3 |
| Hafnium | Hf | +4 | Hf4+ | HfCl4, Hf2O3 |
| Tantalum | Ta | +5 | Ta5+ | TaCl5, Ta2O3 |
| Tungsten | W | +4, +6 | W4+, W6+ | WCl4, W2O3 |
| Rhenium | Re | +4, +7 | Re4+, Re7+ | ReCl4, Re2O3 |
| Osmium | Os | +3, +4 | Os3+, Os4+ | OsCl3, Os2O3 |
| Iridium | Ir | +3, +4 | Ir3+, Ir4+ | IrCl3, Ir2O3 |
| Platinum | Pt | +2, +4 | Pt2+, Pt4+ | PtCl2, PtO |
| Gold | Au | +1, +3 | Au+, Au3+ | AuCl, Au2O |
| Mercury | Hg | +1, +2 | Hg+, Hg2+ | HgCl, Hg2O |
| Thallium | Tl | +1, +3 | Tl+, Tl3+ | TlCl, Tl2O |
| Lead | Pb | +2, +4 | Pb2+, Pb4+ | PbCl2, PbO |
| Bismuth | Bi | +3, +5 | Bi3+, Bi5+ | BiCl3, Bi2O3 |
| Polonium | Po | +2, +4 | Po2+, Po4+ | PoCl2, PoO |
| Astatine | At | -1, +1 | At-, At+ | NaAt, CaAt2 |
| Radon | Rn | none listed | none listed | context-dependent |
| Francium | Fr | +1 | Fr+ | FrCl, Fr2O |
| Radium | Ra | +2 | Ra2+ | RaCl2, RaO |
| Actinium | Ac | +3 | Ac3+ | AcCl3, Ac2O3 |
| Thorium | Th | +4 | Th4+ | ThCl4, Th2O3 |
| Protactinium | Pa | +4, +5 | Pa4+, Pa5+ | PaCl4, Pa2O3 |
| Uranium | U | +4, +6 | U4+, U6+ | UCl4, U2O3 |
| Neptunium | Np | +3, +4, +5, +6 | Np3+, Np4+, Np5+, Np6+ | NpCl3, Np2O3 |
| Plutonium | Pu | +3, +4, +5, +6 | Pu3+, Pu4+, Pu5+, Pu6+ | PuCl3, Pu2O3 |
| Americium | Am | +3 | Am3+ | AmCl3, Am2O3 |
| Curium | Cm | +3 | Cm3+ | CmCl3, Cm2O3 |
| Berkelium | Bk | +3, +4 | Bk3+, Bk4+ | BkCl3, Bk2O3 |
| Californium | Cf | +3 | Cf3+ | CfCl3, Cf2O3 |
| Einsteinium | Es | +3 | Es3+ | EsCl3, Es2O3 |
| Fermium | Fm | +3 | Fm3+ | FmCl3, Fm2O3 |
| Mendelevium | Md | +2, +3 | Md2+, Md3+ | MdCl2, MdO |
| Nobelium | No | +2, +3 | No2+, No3+ | NoCl2, NoO |
| Lawrencium | Lr | +3 | Lr3+ | LrCl3, Lr2O3 |
| Rutherfordium | Rf | +4 | Rf4+ | RfCl4, Rf2O3 |
| Dubnium | Db | +5 | Db5+ | DbCl5, Db2O3 |
| Seaborgium | Sg | +6 | Sg6+ | SgCl6, Sg2O3 |
| Bohrium | Bh | +7 | Bh7+ | BhCl7, Bh2O3 |
| Hassium | Hs | +8 | Hs8+ | HsCl8, Hs2O3 |
| Meitnerium | Mt | none listed | none listed | context-dependent |
| Darmstadtium | Ds | none listed | none listed | context-dependent |
| Roentgenium | Rg | none listed | none listed | context-dependent |
| Copernicium | Cn | none listed | none listed | context-dependent |
| Nihonium | Nh | +1, +3 | Nh+, Nh3+ | NhCl, Nh2O |
| Flerovium | Fl | +2, +4 | Fl2+, Fl4+ | FlCl2, FlO |
| Moscovium | Mc | none listed | none listed | context-dependent |
| Livermorium | Lv | none listed | none listed | context-dependent |
| Tennessine | Ts | none listed | none listed | context-dependent |
| Oganesson | Og | none listed | none listed | context-dependent |