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Naming Compounds. Naming Compounds.  As mentioned in an early lesson, there are two main types of compounds, ionic and molecular. Some of the compounds that you will learn about this year will require special systems for naming, and we will learn about them at a later time.  .

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Naming compounds1
Naming Compounds

 As mentioned in an early lesson, there are two main types of compounds, ionic and molecular.

Some of the compounds that you will learn about this year will require special systems for naming, and we will learn about them at a later time. 


Naming compounds2
Naming Compounds

I. Binary Compounds :

  • consist of only two elements. 

  • The formula for a binary compound will contain only two capital letters. 



Naming compounds3
Naming Compounds ionic or molecular, follow the following steps

  • STEP 1.  Write the name of the element represented by the first symbol in the formula.


Naming compounds4
Naming Compounds ionic or molecular, follow the following steps

  • STEP 2.  Write the name of the element represented by the second symbol in the formula, but change the ending of the element's name to "ide".


Naming compounds5
Naming Compounds ionic or molecular, follow the following steps

  • STEP 3.  Check a reference table to determine the number of positive oxidation numbers that the first element forms.  If it only forms one then you are done.


Naming compounds6
Naming Compounds ionic or molecular, follow the following steps

  • STEP 4.  If the first element shows more than one oxidation number, than use the stock system.  Determine the oxidation number that the first element is showing and write that roman numeral in-between the two elemental names.


Naming compounds7
Naming Compounds ionic or molecular, follow the following steps

  • Example 1. 

  • What is the correct name for the compound AlBr3 ?


Naming compounds8
Naming Compounds ionic or molecular, follow the following steps

  • Step 1.

  • aluminum


Naming compounds9
Naming Compounds ionic or molecular, follow the following steps

  • Step 2. 

  • bromine becomes bromide.


Naming compounds10
Naming Compounds ionic or molecular, follow the following steps

  • STEP 3

  •   Aluminum always has an oxidation number of +3, therefore ,our answer is;

  • aluminum bromide


Naming compounds11
Naming Compounds ionic or molecular, follow the following steps

  • Example 2. 

  • What is the correct name for the

    Element AgS ?


Naming compounds12
Naming Compounds ionic or molecular, follow the following steps

  • STEP 1

  • Silver


Naming compounds13
Naming Compounds ionic or molecular, follow the following steps

  • Step 2

  • In this case, sulfur becomes sulfide.


Naming compounds14
Naming Compounds ionic or molecular, follow the following steps

Step 3

Silver forms oxidation numbers of +1, +2, so we must go to the next step.


Naming compounds15
Naming Compounds ionic or molecular, follow the following steps

  • Step 4

  • We check the oxidation number of sulfide and find that it is -2.  If one silver is canceling out one sulfur than the apparent charge on the silver must be +2.  (+2) + (-2) = 0.

  • So the name is

  • Silver (II) Sulfide


  • Example 3.  ionic or molecular, follow the following steps

  • What is the correct name for the compound Fe2O3 ?


  • Step 1. Write the name of the element represented by the first symbol in the formula.

  • iron

  • Step 2.  Write the name of the element represented by the second symbol in the formula, but change the ending of the element's name to "ide".  So, oxygen becomes oxide.

  • iron oxide

  • Step 3.  Check a reference table to determine the number of positive oxidation numbers that the first element forms.  If it only forms one then you are done. Iron can be +2 or +3, so we must go on to step 4.

  • Step 4.  If the first element shows more than one oxidation number, than use the stock system.  Determine the oxidation number that the first element is showing and write that roman numeral in-between the two elemental names.  We know that oxygen is -2 in this case.   Since we have 3 atoms of oxygen, each with a charge of  -2, then the total negative charge is -6.  We must have +6 to balance out the -6.  Since there are two iron atoms to make up a total of +6, each must be +3.  2(+3) + 3(-2) = 0.

  • iron(III) oxide


Ii ternary compounds compounds contain three elements
II. Ternary Compounds first symbol in the formula. - compounds contain three elements. 

  • The only type of ternary compounds that we will learn how to name are those that consist of one polyatomic ion and one monatomic ion. 



  • Step 1.  positive monatomic ion and a negative polyatomic ion. 

  • Write the name of the element represented by the first symbol in the compound.


  • Step 2.  positive monatomic ion and a negative polyatomic ion. 

  • Write the name of the polyatomic ion, without changing the ending.


  • Step 3.  positive monatomic ion and a negative polyatomic ion. 

  • Check a reference table to determine the number of positive oxidation numbers that the first element forms.  If it only forms one then you are done.


  • Step 4.  positive monatomic ion and a negative polyatomic ion. 

  • If the first element shows more than one oxidation number, than use the stock system. 

  • Determine the oxidation number that the first element is showing and write that roman numeral in-between the two names.


  • Example 1.  positive monatomic ion and a negative polyatomic ion. 

  • Can you name the compound Ca(CN)2 ?


  • Step 1 positive monatomic ion and a negative polyatomic ion. 

  • Calcium


  • Step 2.  positive monatomic ion and a negative polyatomic ion. 

  • Calcium Cyanide


  • Step 3.  positive monatomic ion and a negative polyatomic ion. 

  • Calcium can only be +2, so we must be done.

  • Calcium Cyanide


Step 4
Step 4 positive monatomic ion and a negative polyatomic ion. 

  • iron(II) nitrate



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