1. Describe the reaction between sodium and chlorine in the lab.
2. Why do atoms of most elements form bonds?
3. Why is welding often carried out in an atmosphere of argon?
4. Give a diagrammatic representation of the formation of
a. sodium ion
b. chloride ion
5. What are ions?
6. When does an atom become an ion?
7. Explain why a sodium ion has a charge of 1+ and a chloride ion has a charge of 1-