Common Ions and Their Charges Monatomic Monatomic Cations Name Anions Name H+ hydrogen F- fluoride Li+ lithium Cl- chloride Na+ sodium Br- bromide K+ potassium I- iodide Rb+ rubidium O2- oxide Cs+ cesium S2- sulfide Be2+ beryllium Se2- selenide Mg2+ magnesium Te2- telluride Ca2+ calcium N3- nitride Sr2+ strontium P3- phosphide Ba2+ barium As3- arsenide Al3+ aluminum Ga3+ gallium In3+ indium Ag+ silver (memorize) Zn2+ zinc (memorize) Monatomic Name Polyatomic Cations (Roman numeral Ions Name (multiple gives the positive To oxidation charge!) memorize state) 3+ + Fe iron(III) NH4 ammonium 2+ - Fe iron(II) NO2 nitrite 2+ - Cu copper(II) NO3 nitrate + 2- Cu copper(I) SO3 sulfite 3+ 2- Cr chromium(III) SO4 sulfate Ni2+ nickel(II) OH- hydroxide 4+ 3- Pb lead(IV) PO4 phosphate 2+ 2- Pb lead(II) CO3 carbonate 2+ - Hg mercury(II) ClO3 chlorate - C2H3O2 acetate – TABLE OF POLYATOMIC IONS 2– acetate CH3COO oxalate C2O4 PERIODIC TABLE OF IONS 3– – – arsenate AsO4 dihydrogen phosphate H2PO4 perchlorate ClO4 arsenite AsO 3– hydrogen carbonate HCO – periodate IO – KEY 3 3 4 atomic ion C H COO– hydrogen oxalate HC O – permanganate – 26 benzoate 6 5 2 4 MnO4 number Fe3+ charge BO 3– hydrogen sulfate HSO – peroxide 2– 1 borate 3 4 O2 iron (III) ion 17 18 bromate BrO – hydrogen sulfide HS– phosphate PO 3– name 3 4 symbol Fe2+ (IUPAC) 1 2 1 CO 2– hydrogen sulfite HSO – 4– + carbonate 3 3 pyrophosphate P2O7 iron (II) - H – – 2– H He chlorate ClO3 hydroxide OH sulfate SO4 hydrogen 2 – – 2– hydride helium chloride Cl hypochlorite ClO sulfite SO3 13 14 15 16 – – – 3 4 chlorite ClO2 iodate IO3 thiocyanate SCN 5 6 7 8 9 10 + 2+ 2– 2– 2– 3- 2- - Li Be chromate CrO4 monohydrogen phosphate HPO4 thiosulfate S2O3 B C N O F Ne – – lithium beryllium cyanate CNO nitrate NO3 POSITIVE POLYATOMIC IONS boron carbon nitride oxide fluoride neon cyanide CN– nitrite NO – ammonium NH + 11 12 2 4 13 14 15 16 17 18 dichromate Cr O 2– orthosilicate SiO 4– hydronium H O+ Na+ Mg2+ 2 7 4 3 Al3+ Si P3- S2- Cl- Ar sodium magnesium 3 4 5 6 7 8 9 10 11 12 aluminum silicon phosphide sulfiide chloride argon 19 20 21 22 Ti 4+ 23 V 3+ 24 Cr 3+ 25 Mn 2+ 26 Fe 3+ 27 Co 2+ 28 Ni 2+ 29 Cu 2+ 30 31 32 33 34 35 36 K+ Ca2+ Sc3+ titanium (IV) vanadium(III) chromium (III) manganese(II) iron (III) cobalt (II) nickel (II) copper (II) Zn2+ Ga3+ Ge4+ As3- Se2- Br- Kr 3+ 5+ 2+ 4+ 2+ 3+ 3+ + potassium calcium scandium Ti V Cr Mn Fe Co Ni Cu zinc gallium germanium arsenide selenide bromide krypton titanium (III) vanadium (V) chromium (II) manganese(IV) iron (II) cobalt (III) nickel (III) copper (I) 37 38 39 40 41 Nb 5+ 42 43 44 Ru 3+ 45 46 Pd 2+ 47 48 49 50 Sn 4+ 51 Sb 3+ 52 53 54 Rb+ Sr2+ Y3+ Zr4+ niobium (V) Mo6+ Tc7+ ruthenium(III) Rh3+ paladium(II) Ag+ Cd2+ In3+ tin (IV) antimony(III) Te2- I- Xe 3+ 4+ rubidium strontium yttrium zirconium Nb molybdenum technetium Ru4+ rhodium Pd silver cadmium indium Sn2+ Sb5+ telluride iodide xenon niobium(III) ruthenium(IV) paladium(IV) tin (II) antimony(V) 55 56 57 72 73 74 75 76 77 78 4+ 79 3+ 80 2+ 81 + 82 2+ 83 3+ 84 2+ 85 86 Pt Au Hg Tl Pb Bi Po - Cs+ Ba2+ La3+ Hf4+ Ta5+ W6+ Re7+ Os4+ Ir4+ platinum(IV) gold (III) mercury (II) thallium (I) lead (II) bismuth(III) polonium(II) At Ra cesium barium lanthanum hafnium tantalum tungsten rhenium osmium iridium Pt2+ Au+ Hg+ Tl3+ Pb4+ Bi5+ Po4+ astatide radon platinum(II) gold (I) mercury (I) thallium(III) lead (IV) bismuth(V) polonium(IV) 87 88 89 Fr+ Ra2+ Ac3+ francium radium actinium 58 59 60 61 62 Sm 3+ 63 Eu 3+ 64 65 66 67 68 69 70 Yb 3+ 71 Ce3+ Pr3+ Nd3+ Pm3+ samarium(III) europium (III) Gd3+ Tb3+ Dy3+ Ho3+ Er3+ Tm3+ ytterbium(III) Lu3+ cerium praseodymium neodymium promethium Sm2+ Eu2+ gadolinium terbium dysprosium holmium erbium thulium Yb3+ lutetium samarium(II) europium (II) ytterbium(II) 90 91 Pa 5+ 92 U 6+ 93 94 Pu 4+ 95 Am 3+ 96 97 Bk 3+ 98 99 100 101Md 2+ 102 No 2+ 103 Th4+ protactinium(V) uranium (VI) Np5+ plutonium(IV) americium(III) Cm3+ berkelium(III) Cf3+ Es3+ Fm3+ mendelevium (II) nobelium(II) Lr3+ thorium Pa4+ U4+ neptunium Pu6+ Am4+ curium Bk4+ californium einsteinium fermium Md3+ No3+ lawrencium protactinium(IV) uranium (IV) plutonium(VI) americium(IV) berkelium(IV) mendelevium (III) nobelium(III).