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  Electron Affinity

Electron Affinity or Electron gain enthalpy (E.A.):

The electron affinity of an element might be stated as quantity of energy that is discharged when an extra electron comes into the valence orbital of an isolated neutral atom to make a negative ion.

Atom (g) + Electron (g) → Negative ion (g) + Energy

The bigger the energy discharged in the procedure of taking up the extra electron, the bigger will be the electron affinity. Therefore, ionisation potential measures the tendency of an atom to alter into a cation (M → M+ + le-) while the electron affinity measures the tendency of an atom to modify into anion (X + e- → X-).

1038_Electron AffinityTable.jpg

 

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