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  1. neon. Table of Polyatomic Ions. acetate CH 3COO- dichromate Cr 2O 2-. 7 dihydrogen phosphate H 2PO -. 4. ammonium NH4 + cyanide CN- silicate 2- SiO3 benzoate C6H5COO- hydroxide OH- sulphate SO4 2-. borate BO3 3- iodate - IO3 sulphite 2- SO3 carbonate 2- CO3 nitrate - NO3 hydrogen sulphide HS-.

  2. chlorite ClO2 – iodate IO3 – thiocyanate SCN–. Li+ Be2+. chromate CrO42– monohydrogen phosphate HPO42– thiosulfate S2O32–. lithium beryllium. cyanate CNO– nitrate NO3 – POSITIVE POLYATOMIC IONS cyanide CN– nitrite NO2 –. 11. ammonium NH4+. 12. dichromate Cr2O72– orthosilicate SiO44– hydronium H3O+.

  3. h+. hydrogen. 1. li + lithium. 3. na + sodium. 11. k + potassium. 19. rb + rubidium. 37. cs + cesium. 55. fr + francium. 87. be. 2+ beryllium. 4. mg. 2+ magnesium. 12 ...

  4. Roman numeral notation indicates charge of ion when element commonly forms more than one ion. For example, iron( II ) has a 2+ charge; iron( III ) a 3+ charge.

  5. Tips for Learning the Ions. “From the Table” These are ions can be organized into two groups. Their place on the table suggests the charge on the ion, since the neutral atom gains or loses a predictable number of electrons in order to obtain a noble gas configuration.

  6. More Symbols and Charges for Polyatomic Ions S2O32¯ thiosulfate HS¯ hydrogen sulfide AsO43¯ arsenate BO33¯ borate SeO42¯ selenate B4O72¯ tetraborate SiO32¯ silicate SiF62¯ hexafluorosilicate C4H4O62¯ tartrate SCN¯ thiocyanate C2H3O2¯ acetate (an alternate way to write acetate is CH3COO¯) There is one positive polyatomic ion. It is NH4+ and is called the ammonium ion.

  7. Chemistry Ion Chart Chart of Common Ions/Ionic Charges POSITIVE IONS (CATIONS) NEGATIVE IONS (ANIONS) Aluminium Al3+ Acetate CH 3COO-Ammonium NH 4 ... Element symbol * Element name 1 H Hydrogen 1.01 3 Li Lithium 6.94 11 Na Sodium 22.99 19 K 39.10 28 Ni Nickel 58.69 37 Rb Rubidium 85.47 59 Pr 140.91 104 Rf (261) 42 Mo 95.94 101 Md (258) 32 Ge 72 ...

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