1. CHEM 121 Chapter 3

2. 3-minute review
Draw the Lewis Structures for each of the following neutral atoms: Cs Na F Ar

3. Reactivity of Elements
Compounds form so each atom can have a Ionic compound: Covalent compound:

4. Ions: charged particles
Metals
Nonmetals + -

5. 3-minute review
Predict whether these bonds in these molecules are ionic or covalent
Br2
CaO
MgCl2
NO2

6. Ionic Charge Elements Elements ordered by atomic number
“Periodic” trends
Periodic table by Mendeleev (1871)

7. 3-minute review Predict the most common ion for each of these: O I SMg Cs Al N

8. Electron Configurations
For ions:
Ex. O2-
Ex. Al3+

9. Common ions in the body

10. Ionic Compounds
Cation + Anion + Strontium and Iodine Nitrogen and Cesium

11. 3-minute review
Write the name for the compound that forms between the following pairs of elements:
Sodium and fluorine
Bromine and calcium
Sodium and sulfur
Sulfur and magnesium

12. Ionic Compounds

13. Ionic Compounds Net ionic charge Examples: Potassium chloride
Calcium bromide
Magnesium sulfide
Lithium oxide

14. 3-minute review
Write the formula for the following compounds: Sodium bromide Magnesium chloride Potassium sulfide

15. Metals that form more than one ion
Usually in B groups (transition metals)
Ex. Iron
chromium
copper
gold
iron
lead
tin
Cr2+
Cu+
Au+
Fe2+
Pb2+
Sn2+
Cr3+
Cu2+
Au3+
Fe3+
Pb4+
Sn4+

16. 3-minute review
Write the name for AuN Write the formula for the following compounds: Copper (II) iodide Chromium (III) sulfide Lead (IV) oxide

17. Properties of Ionic Compounds+ -

18. Polyatomic Ions Monatomic Ions: Cl- Na+ Polyatomic ions: Examples:
See Table 3.5 in your book

19. Polyatomic Ions
Nitrate: charge =
Sulfate: charge =
Examples:

20. 3-minute review
Name the following:
Al(OH)3
NaNO3
KNO2
MgSO4