Electron Affinity is the energy change for the process of adding an electron to a gaseous atom to form an anion (negative ion).
X(g) + e− ⟶ X−(g)
You can add an electron to whatever element you want, but typically we usually talk about electron affinity with non-metals because those are the ones that usually gain electrons. Example: O ⟶ O2-
Pauling Electronegativity values
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