Metal ions are charged particles that form when metal atoms lose one or more electrons. This process gives them a positive charge, allowing them to interact with other substances. Common examples of metal ions include sodium (Na+) and calcium (Ca2+). They play essential roles in various chemical reactions and biological processes. In nature, metal ions are often found in minerals and are crucial for life. For instance, iron (Fe2+) is vital for transporting oxygen in the blood, while magnesium (Mg2+) is important for many enzymatic reactions. Their unique properties make them valuable in industries like electronics and medicine.