Electron Affinity

Electron Affinity is the amount of energy required for an atom to attain an electron (in kJ/mol) of an atom in its gaseous state.

Ex. X +   1e→ X

Ex. X +   1e → X-2

EA is a measured value determined in units of kJ/mol like ionization energy.

Trend: As you move from:

LEFT  RIGHT   EA ↑

TOP  BOTTOM   N/A

Why? Right-most elements are nonmetals and like to gain electrons, hence they have an affinity for electrons or ↑ EA.

Left-most elements are metals who have no desire to keep electrons, thus: ↓ EA.

EA

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