First ionization energy has been defined as the energy required to remove the most loosely held electron from an electrically neutral atom. Second ionization energy is the minimum energy required to remove an electron from a +1 cation (from an atom that has already lost its first electron). In the same way third ionization energy is the minimum energy to remove an electron from a +2 cation (from an atom that has lost two electrons).
Below is a table of first, second, third and fourth ionization energies for Na, Mg and Al. Explain this data for the magnesium atom in terms of its electron configuration.

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The Answer of First ionization energy has been defined as the energy required to remove the most loosely held electron from an electrically neutral atom. Second ionization energy is the minimum energy required to remove an electron from a +1 cation (from an atom that has already lost its first electron). In the same way third ionization energy is the minimum energy to remove an electron from a +2 cation (from an atom that has lost two electrons).
Below is a table of first, second, third and fourth ionization energies for Na, Mg and Al. Explain this data for the magnesium atom in terms of its electron configuration.

First Ionization Energy Has Been Defined as the Energy Required