How many valence electrons does an atom of Al possess?

1 Answer
reudhreghs
Apr 6, 2016

#3#

Explanation:

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.

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