What is the name for negatively charged ions?

Negatively charged ions are referred to as anions. An anion is formed when an atom gains one or more electrons, resulting in an overall negative charge due to the excess of electrons over protons. This concept is fundamental in the study of chemistry and biology, as the interactions between cations (positively charged ions) and anions play a crucial role in various biological processes, such as electrolyte balance and nerve impulse transmission. Understanding the nature of anions also helps in comprehending how they participate in chemical reactions and contribute to the formation of compounds.