1.  a) Which of the following neutral atoms is most unreactive or inert?  Cl   or  Ar  or K   or Ca

b)  Which of the following  +1 cations  is most unreactive or inert?  Cl+   or  Ar+  or K+   or Ca+

c)  Which of the following -1 anions  is most unreactive or inert?  Cl-    or  Ar -   or K-    or Ca-

2. Predict the formula of the following compounds:

a) Litium oxide

b) Magnesium sulfide

c) Calcium nitride

d) Copper (II) chloride.

3. Which of the following are metals and which are non-metals

a) Phosphorous

b) Cobalt

c) Carbon

d) Potassium

e) Silver

4. What are 5 properties of metals or non metals that co-exist ie are various manifestations of the same idea.

5. Predict the charges on the following anions:

a) OH

b) CO3

c) NO3

d) PO4

6. Predict the charges on the following cations.

a) Al

b) NH4

c) Ca

7. a) Given the charges of the ions in 5d and 6c; predict the formula of Calcium phosphate.
 
 
 
 

b) What is the predicted formula of ammonium phosphide?
 
 
 
 c) What would be the predicted formula of aluminum hydroxide?