How to Predict an Element from Its Ionization Energies

The energy required to remove an electron (e─) from the isolated atom/ion in the gaseous state of an element is referred to as the ionization energy/potential (IE/IP).


For an element, IE involves an endothermic reaction; and in general, IE3 > IE2 > IE1.

Question:

Based on the ionization energies (kJ/mol) for an element X (first to fifth: 786, 1577, 3228, 4354, 16100), which element is X most likely to be?

Solution:

Click/tap to enlarge the image

VSE = Valence-shell electron

EC = Electron configuration

Easy❓ Let Chemaficionado know in the comments below or at mychemistryhomework@gmail.com❗

References:

(1)    Wikipedia. Ionization energy. Wikipedia. https://en.wikipedia.org/wiki/Ionization_energy.

‌(2)    Ionization energies of the elements (data page). Wikipedia. https://en.wikipedia.org/wiki/Ionization_energies_of_the_elements_(data_page).

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