Definitions for "Electron affinity"
Keywords:  affinity, gaseous, ion, atom, chemguide
The enthalpy change for the addition of one electron to an atom or ion in the gaseous state. For example, the electron affinity of hydrogen is H in the reaction H(g) + H-(g) H = -73 kJ/mol.
The energy change accompanying the addition of an electron to a species.
the attraction of an atom for an electron; the energy change that occurs when a gaseous atom acquires an electron. (see ionization energy, electronegativity)