We've learned all these things before.
Here's what we come up with new understandings of the atom and how the electrons work within
it.
Now, we're going to say according to Bohr's model, it helps explain what happens when
electron absorbed or released energy within a hydrogen atom.
What we're going to say here is, this blue right here represents our nucleus, where we
find our protons and our neutrons.
And here we’re going to say that this first circle here represents our first shell.
In our first shell, we have an electron.
That electron is going to absorb light energy from a photon.
When that electron absorbs this energy, it becomes excited.
So that's what we're going to put down here.
We're going to say, when it absorbs enough energy, it becomes excited.
Once it becomes excited, it's able to jump from the first shell or whatever shell it's
into a higher leveled shell.
The electron absorbs energy and it jumps up to here, so that's why we find it in the second
shell.
The thing is, electrons that absorb energy, they can't hold on to the energy forever.
Eventually, they're going to release this energy slowly back from where it came.
So the electron is slowly going to release this energy and this energy is going to be
emitted as heat or light and when it's releasing this energy back from where it came, it's
going to come and return back to what we call its ground-state level.
Ground state level just means that it returns to the level it was at before it absorbed
that energy.
What we should see to the right of this -- so we've already talked about what happens when
it absorbs energy—it jumps up to a higher level.
When it releases energy it falls back down to its previous level.
Here on the right side, we have a diagram.
Now, this diagram basically shows us how much energy is required when we go from one shell
to the next shell.
As you can see here, this represents shell number one, shell number two, three, four,
infinity, and we're going to say that in this model, distance equals energy.
So you can see that going from shell one to shell two is the biggest difference, the biggest
distance involved.
Because of that, we're going to say going from one to two or two to one involves the
most amount of energy, because we said that the distance equals energy.
You’re also going to notice as we go from two to three, the distance gets a lot smaller,
so we're going to say going between two and three requires less energy.
As we go from three to four, it gets even smaller.
You can see in the pattern if we're trying to go from level four to five, it'd be even
smaller still and going from six to seven—it will be almost like doing nothing.
You'd be able to just step over into the next shell.
So we're going to say the higher up you go in shell number, the smaller the distance
is and the less energy is required of us to go from one to the other.
Just remember this, the lowered number shells, there's bigger difference in distance between
them and because of that, it takes more energy.
So it takes more energy to go from one to two than it does to go from three to four.
Just remember when we talk about absorption, we're having the electron go from a certain
level up to a higher numbered level.
When it releases or what we say emits this absorbed energy, it's going to fall back down.
It's going to go from a larger number, back down to a smaller number.
Just remember these concepts, what's the difference between absorption and emission and remember
distance equals energy in terms of the electron going from one shell to the next shell.