Hello,
Aluminium is a metal with 13 as its atomic number, in such a way, one could foresee the Lewis structure via its electron configuration:
Al^{13}: 1s^22s^22p^63s^23p^1
It is seen that in its last level, 3, there are three electrons, two from 3s^2 and one from 3p^1, in such a way one states that aluminium has three valence electrons which are equal to the electrons at its outer shell. The Lewis representation for aluminium is shown on the attached picture.
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~Angoraspinner (AKA jack)
