The only group three element in period 3 is aluminium. Therefore, the element is aluminium.
First Ionization energy is defined as the energy required to remove the first electron from the valence shell of an atom. We know that there are n ionization energies for an atom where n = number of electrons in the atom.
If we look at the eight ionization energies listed; 578, 1817, 2745, 11577, 14842, 18379, 23326, and 27465 all in kJ/mol, we will discover that there is a quantum jump between the third and the fourth ionization energy which indicates that the fourth electron is being removed from an inner shell.
The valence shell therefore must contain three electrons. Since the element is in period 3, the only group three element in period 3 is aluminium. Therefore, the element is aluminium.
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