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Electron Affinity Definition

Chemistry Glossary Definition of Electron Affinity


Definition: Electron affinity reflects the ability of an atom to accept an electron. It is the energy change that occurs when an electron is added to a gaseous atom. Atoms with stronger effective nuclear charge have greater electron affinity.

Example: The electron affinity of hydrogen is ΔH in the reaction

H(g) + e- → H-(g); ΔH = -73 kJ/mol.

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