Diamagnetic Diatomic Molecules. Part 1

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First of all we classify the molecules or ions depending on the total number of electrons present in them in the following three 03 sets.

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For the prediction of number of unpaired electrons n of molecules or ions having total number of electrons , , , and electrons:. For the molecules or ions containing electrons, electrons, electrons, and electrons the ND value will be 4, 6, 8 and 14 respectively. For the prediction of number of unpaired electrons n of molecules or ions having total number of electrons and :. For the prediction of number of unpaired electrons n of molecules or ions having total number of electrons I have this picture of this balance drawn down here.

So let's say that our paramagnetic sample is in here. So right there in magenta. And we haven't turned on the magnet yet. So here we have a magnet. There's a north pole and a south pole. So before we turn the magnet on, let's just say that our paramagnetic sample is balanced by some balancing weight over here on the right side. Right so there's a pivot point right here but we have everything balanced perfectly. Alright so let's now turn the magnet on. So we turn the magnet on and the magnetic field lines go from north pole to south pole like that.

And if we have a paramagnetic sample. With one or more unpaired electrons, our paramagnetic sample is pulled into this external magnetic field that we've just turned on. And so this is pulled down, right? So this whole part is pulled down. And so let me go ahead and redraw it here.

And so this would be pulled down into the magnetic field and so our paramagnetic sample is pulled into the magnetic field. Right what does that do to our balance? Well of course that's going to pull this side down. And so that's going to pull and our balance is going to rotate about this axis, right? And so this part's gonna go up. So just simple physics. So this weight's gonna go up.

Please note:

It's like our paramagnetic sample has gained weight. And of course it hasn't gained weight, just experiencing a force. There's a magnetic force because it is a paramagnetic substance. And so this balance allows us to figure out if something is paramagnetic or not. Let's look at the definition for diamagnetic.

MO Diagram

So for diamagnetic all electrons are paired. So we have, if we have spin up, we have spin down. And so the magnetic fields cancel. And so a diamagnetic sample would not be attracted to an external magnetic field.

Why is liquid oxygen magnetic?

Actually it produces its own magnetic field in the opposite direction. So it's actually weakly repelled by an external magnetic field. So we have these two definitions. Paramagnetic and diamagnetic. And we can figure out if atoms or ions are paramagnetic or diamagnetic by writing electron configurations.

So let's look at a shortened version of the periodic table. And let's look at some elements.

And let's figure out whether those elements are para- or diamagnetic. Let's start with helium. So helium right here. We need to write the electron configuration for helium. So this would be 1s1 and then we get 1s2. So I'm assuming you already know how to write your electron configurations. So we have 1s2 which means we have two electrons in a 1s orbital.

Here's our 1s orbital. We have two electrons and they must be spin paired. Right so the electrons are completely paired and that means that helium is diamagnetic. Helium is diamagnetic. So helium atoms I should say. Let's do carbon next. Let's find carbon. Let me change colors here. Here's carbon on the periodic table. If I wanted to write an electron configuration for carbon, well it would be 1s2. Right so I'll start 1s2.

Types of Interaction

Then we have 2s2. So 2s2. And then we have, we're in the 2p1 and then 2p2. So 1s2, 2s2, 2p2 is the electron configuration for carbon. If you write in orbital notation. Right so we would have our 1s orbital here.

And our 2s orbital here. And then we have three 2p orbitals like that. So we'll put in your electrons. We have six electrons.

Diamagnetic Diatomic Molecules Part 1

Alright so two in the 1s orbital. So we put those in. Two in the 2s orbital. We put those in. And remember Hund's rule, right? We have two electrons in the p orbital. But we don't pair those spins, right? We don't pair those spins. And so we have. We have unpaired electrons. We have unpaired electrons here for carbon when we draw out the orbital notation. And unpaired electrons means that carbon is paramagnetic.

So carbon is paramagnetic. Carbon atoms anyway.