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Electron affinity is how much an element attracts another electron, so it is directly related to ionization. If an element has a very high or very low electron affinity, it will easily gain or loose an electron, so it will easily ionize.
They are not the same. Electron affinity has no clear periodicity, and elements on the top left of the period table tend to have higher electro affinity. On the otehr hand, ionization energy display clear periodicity.
Ionization energy is the energy required for an element to lose an electron in a gaseous state; electron affinity is the amount of energy released when an element gains an electron in a gaseous state.
The ionization energy is the energy required to remove an electron from a neutral atom whereas the electron affinity is the energy change when a neutral atom attracts an electron.
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