The gap in first, second and third ionization energy values helps to guess:.

Explanation

The ionization energy is the energy required to remove an electron from an atom or ion. The first, second, and third ionization energies are particularly important for predicting the valency of an element and understanding its chemical behavior.For example, aluminum (Al) has the following ionization energies:First ionization energy: Relatively lowSecond ionization energy: Moderately highThird ionization energy: Significantly higherBased on these values, you can predict that aluminum has a valency of +3, and it tends to lose three electrons to form Al³⁺ ions in chemical reactions.