1. 5.4 – NOTES Ionic Compounds and Ions

2. Ionic compounds: substances composed of positive and negative ions
Ions: electrically charged atoms or groups of atoms

3. Sodium atom
Sodium ion
 11 protons
+11
11 protons
11 electrons
-11
10 electrons
-10 X
0 charge
+1 charge, Na+

4. Chlorine atom
Chlorine ion
 17 protons
+17
17 protons
17 electrons
-17
18 electrons
-18
0 charge
-1 charge, Cl-

5. Ionic compounds are neutral, because positive and negative charges offset each other
Crystal: the 3D network of positive and negative charges
Anion: negatively charged ion
Cation: positively charged ion “cations are pawsitive”
Formula Unit: the simplest unit of an ionic compound

6. Ionic compounds dissolve in water because water has regions with partial positive and partial negative charges.
Draw!

7. Hexane (C6H14) does not contain positive or negative regions, therefore it cannot dissolve ionic compounds. But it will dissolve the halogens (Cl2, Br2 and I2) because they also do not contain positive and negative regions.
Like dissolves like!