Electron affinity is the measure of the attraction of an electron toward an isolated gaseous atom. When an electron is added to an isolated gaseous atom or ion energy is either released or absorbed; this energy change is known as electron affinity. Electron affinity is positive when energy is absorbed, and it is negative when energy is released. identify which of the following statements matches each reaction. Statments =Electron affinity is -349 kJ. Electron affinity is +349 kJ. Electron affinity is -142 kJ. Electron affinity is +142 kJ. Electron affinity is -710 kJ. Electron affinity is +710 kJ. Process is endothermic. Process involves single electron addition. Reactions = Cl(g)+e−→Cl−(g), O(g)+e−→O−(g) , O−(g)+e−→O2−(g), All three of the reactions, None of the reactions