1. Ionic Compounds

2. What do these have in common?
CO H2O C3H HCl C6H12O MgCl K2O
What do these have in common?

3. They are all compounds – 2 or more elements chemically bound together

4. Ionic Compounds
Ionic compounds are compounds that consist of a positive ion and a negative ion that are attracted to one another because of their opposite electrical charges.

5. What are ions?
An atom or group of atoms that has gained or lost electrons and has a negative or positive charge as a result.

6. Positively charged ions (cations)
Ca Na K Mg Al Sr2+
The first one is a calcium ion. What are the other ones called?
Positively charged ions (cations)

7. Sodium
Potassium
Magnesium
Aluminum
Strontium

8. Negatively charged ions (anions)
Cl- F- O2- P3- S2- N3- The first one is a chloride ion. What are the other ones called?
Negatively charged ions (anions)

9. Fluoride
Oxide
Phosphide
Sulfide
Nitride

10. What happens when two oppositely charged ions come together?
Na Cl ?

11. They form an ionic compound that has a neutral charge!
NaCl

12. Quick Task
Take all 6 positively charged ions from this presentation and combine them with the 6 negatively charged ions from the this presentation and write their names and formulas

13. Names are easy – positive ions first and negative ions last Sodium chloride

14. A bunch of names Calcium chloride Calcium fluoride Calcium oxide
Calcium phosphide
Calcium sulfide
Calcium nitride
Sodium chloride
Sodium fluoride
Sodium oxide
Sodium phosphide
Sodium sulfide
Sodium nitride
Potassium chloride
Potassium fluoride
Potassium oxide
Potassium phosphide
Potassium sulfide
Potassium nitride
Magnesium chloride
Magnesium fluoride
Magnesium oxide
Magnesium phosphide
Magnesium sulfide
Magnesium nitride
Aluminum chloride
Aluminum fluoride
Aluminum oxide
Aluminum phosphide
Aluminum sulfide
Aluminum nitride
Strontium chloride
Strontium fluoride
Strontium oxide
Strontium phosphide
Strontium sulfide
Strontium nitride

15. Formulas? Remember they have to be neutral after they combine
Ca Cl ?

16. Ca2+ combines with
2 Cl- to give:
CaCl2
The 2 chlorides add up
to -2, cancelling out the
+2 charge of the calcium

17. A bunch of formulas CaCl2 CaF2 CaO Ca3P2 CaS Ca3N2 NaCl NaF Na2O Na3P
Na2S
Na3N
KCl KF
K2O
K3P
K2S
K3N
MgCl2
MgF2
MgO
Mg3P2
MgS
Mg3N2
AlCl3
AlF3
Al2O3
AlP
Al2S3
AlN
SrCl2
SrF2
SrO
Sr3P2
SrS
Sr3N2

18. Polyatomic Ions Polyatomic ions are groups of atoms that have either
a positive or negative charge
Positive: NH ammonium
Negative: SO sulfate
NO3- nitrate
SCN- thiocyanate
CO carbonate
OH- hydroxide
PO phosphate