The ionization energy is the amount of energy absorbed for the formation of a cation. Al, Mg, Si, S, P is the order for the increasing first ionization energy.
Ionization energy is the amount of energy absorbed by an isolated atom of the element so that an electron can be released for the formation of the cation.
In the periodic table, the ionization energy increases when we move from left to right in a period because of an increase in the effective nuclear charge.
The first ionization energy (kJ/mol) for the atoms Al, Mg, Si, S, P are 577.5, 737.7, 786.5, 999.6 and 1011.8 respectively.
Therefore, Al, Mg, Si, S, P is the order for the increasing first ionization energy.
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