Before you work on this prelesson you have to understand ions. Please complete all the Ionic Notation study helps and come back here afterward.

1. Make a balanced ionic compound from sodium and oxygen.
   
   Step 1 - Write the chemical symbols for the elements.
   
   Which of the following is correct?

   1.   ?    Na O
   2.   ?    S O
   3.   ?    So O
   4.   ?    Sd O

2. Make a balanced ionic compound from sodium and oxygen.
   
   Na O
   
   Step 2: Write the charges (oxidation numbers) to the upper right of each chemical symbol.
   
   Which of the following is correct?

   1.   ?    Na¹⁺ O^2-
   2.   ?    Na¹⁺ O^6-
   3.   ?    Na^1- O²⁺
   4.   ?    Na¹¹⁺ O^8-
   5.   ?    Na²⁺ O^1-
   6.   ?    Na³⁺ O^2-

3. Make a balanced ionic compound from sodium and oxygen.
   
   Na¹⁺ O^2-
   
   Step 3: Find the net charge.
   
   Which of the following is correct?

   1.   ?    Net charge = -1
   2.   ?    Net charge = +1
   3.   ?    Net charge = 0
   4.   ?    Net charge = +2
   5.   ?    Net charge = -2

4. Make a balanced ionic compound from sodium and oxygen.
   
   Na¹⁺ O^2- Net charge = -1
   
   Opposites attract, so the above compound will attract an ion of the opposite charge.
   Step 4: Add an ion that's opposite to the net charge.
   
   Which of the following is correct?

   1.   ?    Add a Na¹⁺.
   2.   ?    Add a O^2-.
   3.   ?    Don't add any more charges, it is balanced.

5. Make a balanced ionic compound from sodium and oxygen.
   
   Na¹⁺ Na¹⁺ O^2- Net charge = ?
   
   Repeat step 3: Find the net charge.
   
   Which of the following is correct?

   1.   ?    Net charge = 0
   2.   ?    Net charge = +1
   3.   ?    Net charge = -1
   4.   ?    Net charge = -2
   5.   ?    Net charge = +2

6. Make a balanced ionic compound from sodium and oxygen.
   
   Na¹⁺ Na¹⁺ O^2- Net charge = 0
   
   If the net charge equals zero, what will it attract?

   1.   ?    positive ions
   2.   ?    negative ions
   3.   ?    nothing
   4.   ?    neutral ions

7. Make a balanced ionic compound from sodium and oxygen.
   
   Na¹⁺ Na¹⁺ O^2- Net charge = 0
   
   Step 5: Write the chemical formula for the balanced compound by combine like ions.
   
   Which of the following is the chemical formula for sodium oxide?

   1.   ?    Na₂O
   2.   ?    NaO
   3.   ?    NaO₂
   4.   ?    Na₂O₂