# What is the number of valence electrons in aluminum?

Jul 15, 2017

#### Answer:

For aluminum, $Z = 13$.......and there is a neon core of electrons.......

#### Explanation:

We describe the electronic configuration as $1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{1}$. The valence electrons all have principle quantum number 3, so you tell us the number........

As a consequence most of the chemistry of aluminum deals with $A {l}^{3 +}$..........

Jul 15, 2017

#### Answer:

The number of valance electrons is 3

#### Explanation:

The electron configuration for Aluminum is

$1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{1}$

The first 10 electrons are in the filled first and second shells.

This leaves only three electrons in the third shell $3 {s}^{2} 3 {p}^{1}$

$13 - 10 = 3$

so there are only 3 valance electrons