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They're both interchangeable. Since ionization energy is the energy needed to remove an electron, that means that an atom with a high ionization energy will also have a high electron affinity since it really wants to keep or get electrons.
Electronegativity is a measure of how strongly an atom attracts electrons. Ionization energy is a measure of the energy required to lose an electron. It makes sense that they have the same trend because an atom that strongly attracts electrons (high electronegativity) would require more energy to give up an electron (high ionization energy).
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