Ionization energy increases with an increasing number of electrons.

Question

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Ionization energy generally increases across a period (left to right) in the periodic table as the effective nuclear charge increases, making it harder to remove an electron. However, within a group (top to bottom), ionization energy decreases as the number of electron shells increases, which places the outer electrons farther from the nucleus and makes them easier to remove.

Ionization Energy Increases with an Increasing Number of Electrons