1. Rank the following elements by increasing atomic radius: Carbon, nitrogen, oxygen, potassium, aluminum. 2. Rank the following elements by increasing electronegativity: sulfur, oxygen, fluorine, aluminum, lithium.

3. Arrange the following elements in order of decreasing electron affinity: potassium, lithium, cesium, sodium, francium.

4. Arrange the following elements in order of decreasing ionization energy:

Lithium, oxygen, carbon, boron, fluorine.

5a. Distinguish between a cation and an anion.

5b. How does the size of each compare with the size of the neutral atom from which it is formed?

5c. What is the difference between an atom and an ion?

6. Which atom in each pair has the larger ionization energy?

a. Na or K

b. Cl or Si

c. Li or Be

d. P or Ar

e. Ba or Sr.