Question

how many valence electrons are there in this element? aluminum

Explanation:

Step1: Identify valence shell

Valence electrons are in the outermost shell. For aluminum, the outermost shell is the 3rd shell (3s and 3p).

Step2: Count electrons in valence shell

In the 3s sub - shell, there are 2 electrons (one pair). In the 3p sub - shell, there is 1 electron. So total valence electrons = 2 + 1.

Answer:

3