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Identify the statement that is not correct:

1. The first ionization energy of Al is lower than the first ionization energy of Mg
2. The second ionization energy of Mg is higher than the second ionization energy of Na
3. The first ionization energy of Na is lower than the first ionization energy of Mg
4. The third ionization energy of Mg is higher than the third ionization energy of Al

Correct answer: The second ionization energy of Mg is higher than the second ionization energy of Na

Solution

The second ionization energy of Na (removing from the [Ne] core, ~4562 kJ/mol) is far higher than that of Mg (~1450). So 'IE2(Mg) higher than IE2(Na)' (option 1) is the incorrect statement - not the stored option 3, which is true.

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