what is electron affinity
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The electron affinity of an atom or molecule 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. X + e⁻ → X⁻ + energy In solid state physics, the electron affinity for a surface is defined somewhat differently.
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The electron affinity of an element is the energy liberated when an electron is added to neutral gaseous atom.
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