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Electron affinity measures the energy released when an electron adds to a gaseous atom while Electronegativity, is the tendency of an atom to attract toward itself the electron density in a shared bond. EA is measured in Joules per mole.
Electronegativity describes the tendency of an atom to attract a shared pair of electrons. Electron affinity, simply put, is how badly an element "wants" an electron to make it more stable. They can both be followed by the same trend: they increase going up groups and right across periods.
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