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You can determine the likelihood of an element forming a +3 charge based on its ionization energies by examining the differences between its first three ionization energies. If the difference between the second and third ionization energies is significantly larger than the difference between the first and second ionization energies, it is more likely that the element will form a +3 charge. This is because the large difference in energy required to remove the third electron indicates that the element has a stable electron configuration with a +3 charge.