Periodic Trends (Part 7 of 7) - Electron Affinity (EA ) vs Electronegativity (EN)

In this video, I discuss the difference(s) between Electron Affinity and Electronegativity, since many students often believe both describe an atom’s desire to have an electron and don’t understand what each really is and how they’re different.

What is the difference between Electron Affinity and Electronegativity?

Electron Affinity is, simply, the ENERGY associated with gaining an electron. It applies to a single unbound atom, and it can have many successive values for EA1, EA2, EA3, etc.

Electronegativity describes the ABILITY of an atom to attract electron density across a bond. It applies to an atom in a bond, not a single unbound atom. It also has only one value dependent only on the elemental identity of the atom; this value is relative to Fluorine, which has the highest value (4.0).

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