# How many valence electrons does an atom of Al possess?

Apr 6, 2016

$3$
Aluminium is not a transition metal so acts in the normal way, with electrons filling up by $2$ in the first shell and $8$ in the shells afterwards.
The total number of electrons in an atom is the same as the atomic number, which is found on the periodic table: $13$.
If the first shell holds $2$ in total, and the second shell holds $8$, that's $10$ so far, which means there are $3$ left in the last or valence shell.