In conclusion Electron affinity is more difficult to analyse in molecules as their structure is shows complications. The elements Chlorine strongly attracts electrons while mercury is the element with atoms that most weakly attract an electron. Non-metals typically have higher value than metals. ![]() If value is positive the process is exothermic and occurs spontaneously.Įach of these elements has a completely filled valence electron shell and an electron affinity that approaches zero. The value may be either positive or negative value, the negative value means energy must be present in order to attach an electron to the ion, here the capture of electrons is an endothermic process. It increases when it moves down a column or group and also shows an increase when it moves from left to right across a period or row( except for the noble gases). Electron affinity value measured by unit eV per atom or kJ mol-1. Electron affinity follows a particular path on the periodic table. The above electron affinity equation is an exothermic reaction with the negative sign according to the usual thermodynamics convention in chemistry but the measurement of affinities is always the positive value.
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