On the periodic table, which group of elements will have the highest first ionization energy? Ionization energy is the energy required to remove an electron from the atom.

Question

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The highest ionization energy is found in group 18, the noble gases. These elements have a full valence shell and are very stable elements; thus they are the group where the most energy is required to remove an electron. On the other hand, groups 1 and 2 have only 1 or 2 electrons in their outer shell, and require very little energy to lose an electron.

On the Periodic Table, Which Group of Elements Will Have