Calculate the number of valence electrons in Aluminum using its electron configuration step by step.
Determine the number of valence electrons in Aluminum (Al, Element 13)
The abbreviated (condensed) ground electronic configuration for Aluminum is:
[Ne] 3s2 3p1
Electrons in atomic orbitals outside the [Ne] core are the outermost electrons:
Extract the principle quantum number, n, and number of electrons from the electron configuration:
|Electron Configuration||n||Orbital||Number of Electrons|
The outermost electrons with the largest principal quantum number (in this case, n = 3) are valence electrons.
Aluminum (Al) has 3 (2 + 1) valence electrons.