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  • #10 - Naming of Ionic Compounds

    Now you�ve gone this far as to forming ionic(metal-nonmetal) compounds. Now how would you name those compounds? These compounds are named using a system. It�s very simple; hence, it�s difficult. It is always the simple things that are the hardest to understand.

    How would you name the element Al2O3?

    The first part of the name is the metal:

    Aluminum

    The second part of the name is the first part of the nonmetal with an -ide ending:

    Aluminum Oxide

    Here are other examples:

    Molecule Metal First part of nonmetal -ide Final name
    KCl Potassium
    Chlor-
    -ide Potassium Chloride
    MgO Magnesium
    Ox-
    -ide Magnesium Oxide
    Al2S3 Aluminum
    Sulf-
    -ide Aluminum Sulfide
    Na2S Sodium
    Sulf-
    -ide Sodium Sulfide

    All metal-nonmetal compounds are named the same way, it doesn�t matter how many of each atom there are. (for example: NaCl and Na2S are named the same way even though the first has one sodium and the second has two sodium's)

    The most difficult part of naming metal-nonmetal compounds is remembering what exactly to call and/or spell the nonmetal compounds. The best thing to do is remember the list:

    Nonmetal First part of nonmetal Nonmetals with -ide
    Bromine Brom- Bromide
    Carbon Carb- Carbide
    Chlorine Chlor- Chloride
    Fluorine Fluor- Fluoride
    Iodine Iod- Iodide
    Nitrogen Nitr- Nitride
    Oxygen Ox- Oxide
    Phosphorus Phosph- Phosphide
    Selenium Selen- Selenide
    Silicone Silic- Silicide
    Sulfur Sulf- Sulfide
    Tellurium Tellur- Telluride

    So here is a simple list of steps to naming metal-nonmetal compounds:

    1. Write down the name of the metal
    2. Write down the first part of the nonmetal (ex: Ox-, or Chlor-)
    3. Add -ide to the non-metal (ex: Oxide, or Chloride)
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