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How to know the ionization energy of an element?

I have a question that gives me a list of ionization energies then wants me to write the element it belongs toIt hints that it is in the third periodI looked up that it is AluminumIs there a way to tell which one they are, how would it expect me to solve this other than knowing them already?


you can tell what the ionisation energies are because of the trend across the periodThe first ionisation energy increases as you go across the period, because of increased nuclear charge so it is harder to remove the electronthere are a couple of anomalies such as magnesium having a higher IE than aluminium, but this is because in aluminium an electron is removed from the p-orbital instead which is higher in energy than the s-orbital which magnesiums electrons occupy.

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