Which of the following statement is incorrect?
The second ionization potential of Mg is greater than the second ionization potential of Na.
The first ionization potential of Al is less than the first ionization potential of Mg.
The first ionization potential of Na is less than the first Ionization potential of Mg.
The third ionization potential of Mg is greater than that of Al.
The second ionization potential of Mg is less than the second ionization potential of Na.