electron affinity

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Symbol A. The energy change occurring when an atom or molecule gains an electron to form a negative ion. For an atom or molecule X, it is the energy released for the electron-attachment reaction X(g)+e → X(g)Often this is measured in electronvolts. Alternatively, the molar enthalpy change, ΔH, can be used.

X(g)+e → X(g)

Subjects: Chemistry.

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