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