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It's also interesting to note that elements with low ionization energies typically form cations, which are typically metals. Because metals are grouped on the left side of the periodic table, you can use this as a memory clue to remind you that the ionization energy increases as you move across a period.
As the above two replies stated, ionization energies increase as you move toward the bottom left of the periodic table. This is due to the fact that these electrons are further away from the nucleus so they are more easily removable, and the fact that these elemental atoms have an inclination to lose electrons so they can form cations and reach a stable noble gas configuration. I currently do not know of any exceptions to this rule.
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