Final answer:
Ionization energy is affected by factors such as orbital energy, pairing energy effects, electron shielding, nuclear charge, and electron affinity.
Explanation:
Ionization energy is influenced by various factors. It tends to increase towards the upper left of the periodic table. Factors such as orbital energy, pairing energy effects, electron shielding, and nuclear charge impact ionization energy. Additionally, electron affinity and the ability of an atom's inner electrons to shield its nucleus from valence electrons play crucial roles in determining ionization energy.
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