Type I binary ionic compounds review

Type I Ionic compounds

• Comprised of a metal ion and a nonmetal ion

• The metal anion is a cation (a positively charged ion)

• The nonmetal is an anion (a negatively charged ion)

• In Type I ionic compounds, the cations only come in one "flavor" of charge. Example: sodium is always +1

To name Type I binary ionic compounds:

• Put the cation (metal) first. Use the entire name of the metal. Example: sodium, potassium, calcium, etc.

• Put the name of the anion (nonmetal) section. Change the ending to "-ide." Example: oxide, bromide, chloride, nitride, etc.

• Ions always combine in a way that the charges balance each other. E.g., if you have one calcium (2+ charge), you need 2 chlorines (1- charge) to balance it out.

• Even if a type 1 ionic compound has two copies of an ion (e.g. CaCl₂), it will always be named using the same procedure(e.g., calcium chloride).

​We can use the ions to write the chemical formula of a type (II) compound)

​iron (III) fluoride is the bond between Fe+3 and F-1 meaning that the compound formed is:

​

​FeF3

Polyatomic Ions

There are also ions that form after elements have shared electrons. These ions are known as polyatomic ions, and each polyatomic ion already has a name.

Naming with Polyatomic Ions

• When polyatomic ions are used, simply use the name of the polyatomic ion in the compound.

• Example:

• CaSO₄

• Calcium Sulfate

Polyatomic Formulas

This is just as easy to do with polyatomic ions. You just need to use the name of the polyatomic ion.

Step 1: Write the symbol of the metal ion.

Step 2: Write the formula of the polyatomic ion.

Step 3: Determine the charges using the periodic table and the table of polyatomic ions.

Step 4: Determine the formula from the ions.

Now let's practice!

​Great job! You did it!