Hello, My name is Carole and today i'm going to be talking to you about valence electrons. 
Valence electrons are held in the outer most shell or also known as the orbital.
Valence electrons are the furthest away from the nucleus.
and it is important to know how many valence electrons are in a atom because,
These are the electrons that are involved in chemical bonding to other elements to form molecules.
Ok, I'm sure your familiar with the energy level.
The energy level is where your electrons are.
and what energy level they are in. It's just to help you out. 
I'm going to do an example of chorine. 
Now as you can see chlorine has three levels. 
Chlorine has seventeen electrons. 
In the first level, which is the lowest energy level
we are going to mark that 1s
and there is two electrons in this level.
Next level, we are going to mark this 2s, and then 2p.
Remember we have to try to fill up every level.
The next level is three. 
So far we have ten electrons. 
We are going to try to see if we fill up all these orbitals.
Now these are 3d
this is another orbital.
Okay.
now as you can see, we only have seventeen electrons 
So we can not fill up all of the orbitals in three.
These right here are your valence electrons 
That's seven of them. 
This is the periodic table of elements
What you see in red are your valance electrons.  it goes by column.
Hydrogen has the same amount as potassium. (Should be sodium) and so on.
SO they have one in this column, two, three, four, all the way up to eight.
And these are the elements loose to become ions.
There is one other what to keep track of your valence electrons.
Now this is called a Lewis Dot Stucture. 
And if you can remember chlorine was my example.
Remember, I told you seven valence electrons 
Chlorine
So we have one, two, three four, five, six, and seven
This is a pretty easy way to keep track of your valence electrons. 
A little bit down the road you will start to learn your covalent bonding.
So if you remember hydrogen only has one electron.
So if we but hydrogen over here, 
and we put the valence electron there.
That means, that chlorine will share that valence electron. 
And it will have a full shell of eight valence electrons. 
I hope what I have spoken about today helps you. 
Study hard and good luck!!
