Practice!

Sample Problem

Using the periodic table above, which list is correctly arranged in increasing ionization energy?

3, 7, 4, 5, 2

10, 9, 8, 5, 6

10, 7, 4, 2, 1

3, 6, 5, 7, 10

10, 9, 6, 2, 3

Using the periodic table above, which list is correctly arranged in decreasing ionization energy?

3, 7, 4, 5, 2

10, 9, 8, 5, 6

10, 7, 4, 2, 1

3, 6, 5, 7, 10

10, 9, 6, 2, 3

Solution

Ionization increases as you move from left to right across a period in the periodic table and as you move up a group. In the first question, going along from element 10 to 9 to 6 to 2 to 3 steadily moves right and up, satisfying the increasing ionization trend.

In the second question, going along from element 3 to 6 to 5 to 7 to 10 steadily moves left and down, satisfying the decreasing ionization trend.