Thorp, H. Holden Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina.
- Additional Readings
An atom or group of atoms that bears an electric charge. Positively charged ions are called cations, and negatively charged ions are called anions. When a single atom gains or loses an electron, monoatomic ions are formed. For example, reaction of the element sodium (Na) with the element chlorine (Cl), which occurs as the diatomic gas Cl2, leads to the transfer of electrons from Na to Cl to form Na+ cations and Cl− anions, as shown in the reaction below.
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