Electron affinity (Eea), in chemistry, is defined as the amount of energy released or spent when an electron is added to a neutral atom or molecule in the gaseous state to form a negative ion. The electron affinities of atoms are difficult to measure hence values are available for only a few chemical elements, mostly the halogens. These values were obtained from measurements of heats of formation and lattice energies of ionic compounds of the elements. The electron affinity of an element is a measure of that elements tendency to act as an oxidizing agent (an electron acceptor) and is generally related to the nature of the chemical bonds the element forms with other elements. There are two factors that can affect electron affinity. These are atomic size and nuclear charge.
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