1. BELL RINGER CaF2 Al2S3 What should we call these compounds?
What would be the formula for a BINARY IONIC COMPOUND formed from each pair of elements? Refer to the COMMON ION Periodic Table for charges.
Calcium and Fluorine Aluminum and Sulfur
1 ( +2) 2 (-1) (+3) 3(-2)
Ca F Al S
CaF Al2S3
What should we call these compounds?

2. Naming Binary Ionic Compounds

3. Binary Ionic Compounds
I CAN name a binary ionic compound from its properly written formula.

4. What are BINARY Ionic Compounds?
The formulas we’ve written to this point represent BINARY IONIC compounds:
Consist of only TWO DIFFERENT ELEMENTS.
Contain a + METAL CATION and a – NONMETAL ANION.

5. Naming a Binary Ionic Compound
To name a binary ionic compound:
1. Name the + METAL ION first by its ELEMENT NAME.
2. Name the – NON-METAL ION last by its ELEMENT NAME except:
Change the ENDING to “IDE”.
If the name ends in “INE” just switch to “IDE”.
If the name ends in something else, you may have to DROP PART OF THE NAME before changing to IDE.

6. EXAMPLES Chlorine – ends in “INE” – becomes What does Bromine become?
What about elements that do not end in INE?
Oxygen becomes
Sulfur becomes
Phosphorus becomes
Nitrogen becomes
Arsenic becomes
CHLORIDE
BROMIDE
OXIDE
SULFIDE
PHOSPHIDE
NITRIDE
ARSENIDE

7. Practice Problems Name these compounds: NaCl SODIUM CHLORIDE CaF2
Ba3P2
K3N
AlAs
SODIUM CHLORIDE
CALCIUM FLUORIDE
BARIUM PHOSPHIDE
POTASSIUM NITRIDE
ALUMINUM ARSENIDE

8. More Practice Problems
Determine the FORMULA for the binary ionic compound formed by each pair of atoms, then NAME the compound.
1. Rubidium and Fluorine 6. Francium and Oxygen
2. Potassium and Phosphorus 7. Calcium and Bromine
3. Radium and Nitrogen 8. Strontium and Arsenic
4. Lithium and Sulfur 9. Aluminum and Selenium
5. Boron and Fluorine Rubidium and Astatine

9. 2. K3P Potassium Phosphide 3. Ra3N2 Radium Nitride
1. RbF Rubidium Fluoride
2. K3P Potassium Phosphide
3. Ra3N2 Radium Nitride
4. Li2S Lithium Sulfide
5. BF3 Boron Fluoride
6. Fr2O Francium Oxide
7. CaBr2 Calcium Bromide
8. Sr3As2 Strontium Arsenide
9. Al2Se3 Aluminum Selenide
10. RbAt Rubidium Astatide