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Naming Ionic Compounds. Group 1A  +1 Group 2A  +2 Group 3A  +3 Group 4A  N/A Group 5A  -3 Group 6A  -2 Group 7A  -1 Group 8A  STABLE. The charges of monatomic ions , or ions containing only one atom, can be determined by referring to the periodic table. Charges.

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Naming Ionic Compounds

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Naming ionic compounds

NamingIonic Compounds


Group 1A  +1

Group 2A  +2

Group 3A  +3

Group 4A  N/A

Group 5A  -3

Group 6A  -2

Group 7A  -1

Group 8A  STABLE

The charges of monatomic ions, or ions containing only one atom, can be determined by referring to the periodic table


Elements will gain or lose electrons to have 8 valence electrons. (This is the octet rule)

Ionic compounds

Ionic Compounds

  • ion: atom or group of atoms that has a charge

  • A monatomic ion is one element with a charge

  • A polyatomic ion is more than one element with a charge

    • Example: SO42-

  • ionic compound: compound formed between a cation ( +) and an anion (-).

    • usually between a metal and a nonmetal.

    • also form between a polyatomic ion (like ammonium) and either a metal or nonmetal.

  • TRANSFER valence electrons

  • Formation of ionic compounds

    Formation of Ionic Compounds

    • objects with opposite charges attract each other.

    • ionic bond = the strong attractive force between ions of opposite charge

      • Strongest type of bond!!

    • the overall charge of the compound will be …

    • ZERO!

    Examples of formula writing

    Examples of Formula Writing

    • Write the formula for the compound formed between calcium and nitrogen

    • Step One: Write the symbols and charges of the ions formed

      • Ca2+ N3-

    • Step Two: Balance the charges so the total is ZERO

      • You will need 3 Calcium’s and 2 Nitride’s

    • Step Three: Write the Formula

      • Use subscripts to show the number of each ion needed

      • Ca3N2

    More examples

    More examples

    • Write the formula between Mg and Br

    • Mg+2 Br -1

    • MgBr2

    More examples1

    More examples

    • Write the formula for the compound formed between Ca and S

    • Ca+2 S-2

    • CaS

    Polyatomic ions

    Polyatomic Ions

    • You must use parentheses when using subscripts with a polyatomic ion

    • Ex: Calcium nitrate

    • Ca +2 NO3-1

    • Ca(NO3)2

    Formula writing with polyatomic ions

    Formula writing with polyatomic Ions

    • Write the formula between ammonium and sulfate

    • NH4+1 SO4-2

    • (NH4)2 SO4

    More examples2

    Copper (II) and chlorine

    Silver and Nitrate

    Magnesium and sulfite

    Calcium and sulfur

    Potassium and oxygen

    Ammonium and phosphate

    Ammonium and chlorine








    More examples

    Naming ionic compounds1

    Naming ionic compounds

    • In naming ionic compounds, name the cationfirst, then the anion.

    • Cation name does not change.

      • If the cation can have more than one charge (mostly transition metals), use a Roman Numeral after the element name to indicate the charge

        • Ex. Iron (II) for Fe2+ or Iron (III) for Fe3+

    • Monatomicanions: change the ending to -ide. (ex. Br -, Cl-, O2-)

    • Polyatomic Ions: do not change the name (ex. SO42-, CO32-, PO43-










    Sodium chloride

    Magnesium sulfate

    Copper (II) sulfite

    Potassium phosphate

    Iron (II) nitrate

    Calcium chlorate

    Ammonium nitrite

    Aluminum hypochlorite


    More examples3

    Lead (IV) Oxide

    Ammonium Permanganate

    Cobalt (II) chloride

    Calcium sulfide

    Lithium nitrate

    Sodium acetate

    Tin (II) chloride








    More examples

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