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For elements with diagonal relationships, how would you compare their ionization energies and electron affinities? For example, would oxygen or chlorine have a higher ionization? Oxygen has a smaller shell number but chlorine is further to the right of the periodic table and thus has a higher effective nuclear charge which would attract electrons more strongly.
They are similar because although the element that is further down the group has more electrons it also has a higher effective charge which basically makes it "equal" in electron affinity and ionization energy with the other element which although has less electrons also has a smaller effective charge.
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