Steps to naming ionic compounds

1. Naming Ionic Compounds
Ionic Compounds:
- Compounds formed by ionic bonds.
- They are usually formed with a metal ion and a non-metal ion
How do we name the following compound?
Na2O

2. Naming Ionic Compounds
Steps to naming ionic compounds:
1. Name the elements in the compound
2. Put the two names together, with the more metallic one first.
3. drop the last syllable of the negative ion. End it with -ide.
Na2O
sodium oxygen
oxide

3. Naming Ionic Compounds
1. KBr
_____________________________
2. CaCl2
_____________________________
3. AlF3
_____________________________
4. Na2O
_____________________________
5. CaO
_____________________________
6. Sr3P2
_____________________________
7. Ba3N2
_____________________________
8. CaSe
_____________________________
9. Cal2
_____________________________
potassium bromide
calcium chloride
aluminum fluoride
sodium oxide
calcium oxide
strontium phosphide
barium nitride
calcium selenium
calcium iodide

4. Writing Ionic Compound Formulae
 An ION is an atom that has a charge.
 A CATION is a positive ion. An ANION is a negative ion.
 An ionic compound is formed with a cation and an anion, and must
be Electrically Neutral, or with Charge = 0.
How many calcium and chlorine atoms do we need to get charge = 0?
Ca2+ Cl-
Combining Capacity

5. Writing Ionic Compound Formulae
We can predict the charge on many ions using following rules:
Rule 1: Ions formed from Group 1 of the periodic table have a +1 charge.
Rule 2: Ions formed from elements in Groups 2 of the periodic table have a +2 charge.
Rule 3: Aluminum ions have a +3 charge.
Other elements in Group 13 normally form ions with a +3 charge.
Rule 4: Elements in all other groups form ions with various charges. Some common ones are:
- The nitride ion has a –3 charge
- The sulphide ion has a –2 charge
- The oxide ion has a –2 charge
- All halogens (elements in group 17)
form halide ions with a –1 charge.
Look at your periodic table for combining capacities!

6. Writing Ionic Compound Formulae
How do we write the chemical formula for calcium chloride ?
- Calcium ion:
- Chlorine ion: Cl-
Ca2+
1st
method: The algebraic sum of the charges in a compound is zero.
------------------------------------
Charge: = 0
Ca2+
+2
Cl-
Cl-
-2
We need 1 calcium ion and 2 chloride ions. Therefore, CaCl2

7. Writing Ionic Compound Formulae
How do we write the chemical formula for calcium chloride ?
- Calcium ion:
- Chlorine ion: Cl-
Ca2+
2nd
method: CrissCross: The combining capacities switch to become the subscripts.
Ca Cl
2+ 1-
2
Therefore, CaCl2

8. Writing Ionic Compound Formulae
How do we write the chemical formula for calcium chloride ?
- Calcium ion:
- Chlorine ion: Cl-
Ca2+
3rd
method: Puzzle:
Therefore, CaCl2

9. Writing Ionic Compound Formulae
1. Calcium and chlorine
2. Sodium and oxygen
3. Magnesium and Oxygen
4. Strontium and Iodine
5. Lithium and Oxygen
6. Potassium and Bromine
7. Aluminum and Oxygen
8. Beryllium and Chlorine
CaCl2
Na2O
MgO
SrI2
Li2O
KBr
Al2O3
BeCl2