OpenStax Biology 2e Instructor Answer Guide
Biology 2e
Unit 1: The Chemistry of Life
Chapter 2: The Chemical Foundation of Life
Visual Connection Questions
1. How many neutrons do carbon-12 and carbon-13 have, respectively?
Carbon-12 has six neutrons. Carbon-13 has seven neutrons.
2. Figure 2.7 An atom may give, take, or share electrons with another atom to achieve a full
valence shell, the most stable electron configuration. Looking at this figure, how many electrons
do elements in group 1 need to lose in order to achieve a stable electron configuration? How
many electrons do elements in groups 14 and 17 need to gain to achieve a stable configuration?
Elements in group 1 need to lose one electron to achieve a stable electron configuration.
Elements in groups 14 and 17 need to gain four and one electrons, respectively, to achieve a
stable configuration.
3. Which of the following statements is false?
Biology 2e
Unit 1: The Chemistry of Life
Chapter 2: The Chemical Foundation of Life
Visual Connection Questions
1. How many neutrons do carbon-12 and carbon-13 have, respectively?
Carbon-12 has six neutrons. Carbon-13 has seven neutrons.
2. Figure 2.7 An atom may give, take, or share electrons with another atom to achieve a full
valence shell, the most stable electron configuration. Looking at this figure, how many electrons
do elements in group 1 need to lose in order to achieve a stable electron configuration? How
many electrons do elements in groups 14 and 17 need to gain to achieve a stable configuration?
Elements in group 1 need to lose one electron to achieve a stable electron configuration.
Elements in groups 14 and 17 need to gain four and one electrons, respectively, to achieve a
stable configuration.
3. Which of the following statements is false?
