True or False: Ions can only have a positive charge.

The statement that ions can only have a positive charge is false, making the correct answer 'B'. Ions are atoms or molecules that have gained or lost electrons, leading to a net electric charge. When an atom loses one or more electrons, it becomes positively charged and is referred to as a cation. Conversely, when an atom gains one or more electrons, it becomes negatively charged and is known as an anion. This dual capacity of ions to exist in both positively and negatively charged states is fundamental to many chemical processes, including those related to corrosion in marine environments. Understanding the nature of ions is critical for addressing issues related to galvanic action and electrolysis, which are important concepts in marine corrosion dynamics.