So the negative number is associated with the electrons that are attached to or

connected with an atom.

And this is a value for the energy of the electron.

But to remove it would require you to supply this much ema,

energy in order to get it completely away from the nucleus.

'Kay. Now, we've got another one.

Let's consider another scenario.

So let's change colors for just a moment.

Let's pick hm, how about a purple.

Okay?

Lets move this electron now into the n equals 4 state.

Okay so we've promoted up, it is no longer sitting in the n equals 1.

We now have an n equals 4.

And we have an electron sitting right here.

If we wanted to know the energy of that electron, we'd call n,

with put a little 4 there.

And would a negative 2.18 times 10 to the minus 18 Joules.

This wouldn't change because that's the nuclear charge.

What would change is I would be dividing it by 4 squared, okay?

And when I do that, is again, it is a negative number.

But it's a negative 1.655.

No it's not, negative 1, when we multiply this out,

negative 1.104 times 10 to the minus 17 joules.

Now this is a less of a negative number.