How would you define ions?

Ions are defined as atoms that have gained or lost one or more electrons, resulting in a net charge. This charge can be either positive or negative, depending on whether the atom has lost electrons (creating a positively charged ion, or cation) or gained electrons (resulting in a negatively charged ion, or anion). The ability of an atom to become an ion is crucial in various chemical reactions and processes, such as the formation of compounds, electrical conductivity in solutions, and biological functions in the human body.

Options that specify only one aspect of ionic behavior, such as gaining electrons or losing protons, do not capture the complete definition of ions, which includes the possibility of both gaining and losing electrons and the resultant charge that can be either positive or negative. This comprehensive view is essential for understanding the role of ions in chemistry and physiology.