AP Chemistry/Periodicity

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  • Electronegativity - increases from bottom left to top right

Ionization Energy[edit]

Ionization Energy is the energy required to remove an electron from a gaseous atom or ion.

The first ionization energy is the energy required to remove one of the highest-energy electrons from an atom. In general, first ionization energy increases across a period and decreases down a group. In other words, it increases from bottom-left to top-right.