Question

How many valence electrons does `Al` have?

Answer 1

3 electrons

Explanation:

Aluminum is the third element in the third row of the periodic table. The outermost orbitals to be filled are 3s and 3p. The 3s orbital fills before the 3p orbitals. So, the electron configuration is `[Ne]3s^2 3p^1`. Just by looking at the electron configuration, you see that there are three valence electrons.