Figure 2.3 How many neutrons do carbon-12 and carbon-13 have, respectively?

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?

Figure 2.24 Which of the following statements is false?

1. Molecules with the formulas CH₃CH₂COOH and C₃H₆O₂ could be structural isomers.
2. Molecules must have a double bond to be cis-trans isomers.
3. To be enantiomers, a molecule must have at least three different atoms or groups connected to a central carbon.
4. To be enantiomers, a molecule must have at least four different atoms or groups connected to a central carbon.