Writing and Naming Ionic and Covalent Compounds

Review from last year EVERYONE!

• Covalent compounds are named in different ways than  ionic compounds

• simple covalent compounds are generally named by using prefixes to indicate how many atoms of each element are shown in the formula. 

• the ending of the last (most negative) element is changed to -ide.

• The prefixes used are mono-, di-, tri-, tetra-, penta-, hexa-, and so forth.

• The mono- prefix is usually not used for the first element in the formula. 

• The "o" and "a" endings of these prefixes are dropped when they are attached to "oxide."

 Examples:

Name the following covalent/ionic compound.

1) N₂O₃

2) CO

3) PH₃

4) HI

Answers: 

1) dinitrogen trioxide

2) carbon monoxide

3) phosphorous trihydride

4) hydrogen monoiodide (this compound also is often called by its simple name, hydrogen iodide)

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Barium

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