The arrangement of elements from highest to lowest first ionization energy is;
Ar > Cl > S > P > Si > Al > Mg > Na
Ionization energy refers to the energy required to remove an electron from an atom. Ionization energy is a periodic trend that decreases down the group and increases across the period.
Looking at the trend of ionization energy in the periodic table, the arrangement of elements from highest to lowest first ionization energy is;
Ar > Cl > S > P > Si > Al > Mg > Na
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