7.3 Electron Affinity & Electronegativity

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Electron Affinity

Energy change for gaining an electron

electron affinity

Successive Electron Affinities

The 1st electron affinity for most elements is negative, but any additional successive electron affinities are always positive.

Electron Affinities of Oxygen
O(g) + e- ➔ O-(g) E.A.1 = -141 kJ/mol
O-(g) + e- ➔ O2-(g) E.A.1 = +744 kJ/mol