How tell what group by the ionization energy

how do i know what group the element belongs to if im only given its ionization energy
lets say I had
7.646 15.035 80.143
what group would this element be
i heard you can find its valence by the jump of energy what does that mean?

This element has two valence electrons in the same energy level, like an s-sublevel. Notice that the third ionization energy is much greater indicating that it must come from a lower sublevel, one that is closer to the nucleus, where the electrons require more energy to be removed. The element is most likely found in group IIA.