2. List the following in order of increasing electronegativity (use Figure 14-16 on page 372): O, Na, Al, Ca, Br.
3. Using figure 14-16, locate the element with the highest electronegativity value. What is it? What are the values of its two neighbors?
4. How is the shielding effect related to atomic radii?
5. How does atomic radius change as you read (a) from left to right across a period; (b) from top to bottom of any given group?
6. Identify the atom or ion with the larger radius in each of the following pairs.