![]() ![]() Affinities also measure by direct study of electron capture from heated filaments. It is difficult to obtain but measure from the indirect measurement of Born-Haber energy cycles in which one step is electron capture reaction. Putting the values from above table, the calculated value of E Cl = -348.6 kJ mol -1. ![]() The formation of sodium chloride crystal lattice from sodium and chlorine atom is given below the table, Lattice energy of sodium chlorideīorn – Haber Cycle equation for the formation of crystalline solid, sodium chloride, ΔH f = U NaCl + IE Na + EA Cl + S Na + ❝ Cl. Indirectly, electron affinity can be calculated from Born – Haber cycle data. The periodic table trend of EA is affected by the atomic size, shielding electron, and electron configuration or structure of atom or ion. Electron affinity value measured by unit eV per atom or kJ mol -1. 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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