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### Orbitals on the test

Posted: Sat Oct 20, 2018 11:57 pm
What do we need to know in regards to orbitals for the upcoming test? I'm pretty sure my TA told me that orbitals weren't going to be on the test, but then Lavelle went over them on Friday and said that they would be on the test.

### Re: Orbitals on the test

Posted: Sun Oct 21, 2018 12:47 am
I believe that everything that was covered up till this Friday's lecture is going to be on the test. So basically we need to know the 4 quantum numbers and which combination of quantum numbers is valid. I would look at the diagram with boxes that visualize the shells and subshells. I would also know the shape of the atomic orbitals and which ones are better at shield. (These were all questions from the homework.

### Re: Orbitals on the test

Posted: Sun Oct 21, 2018 11:14 pm
The pictures that Professor Lavelle had on the presentation on Friday about d orbitals had cones and planes surrounding the orbitals while pictures in google images don't include them. What do they mean?

### Re: Orbitals on the test

Posted: Sun Oct 21, 2018 11:17 pm
On the course website, Lavelle states that Test 2 will cover up to quantum numbers. So basically, how to name an electron in an atom.

### Re: Orbitals on the test

Posted: Sun Oct 21, 2018 11:21 pm
According to my TA and what I remember from Lavelle, we will only need to know what quantum numbers each orbital is represented by. We will not need to draw any and we don't even need to know the orientation (only that a particular quantum number means a particular orientation). Really just focus on the numbers not the shapes.

### Re: Orbitals on the test

Posted: Mon Oct 22, 2018 11:05 am
All you need to know is.

Shell Numbers: Eg. n=1,n=2,n=3

Angular Momentum Number: Eg. l=0,l=1,l=2

Magnetic Quantum Number: Eg. ml=l,ml=l-1,ml=1+1

and then spins: either +(1/2) OR -(1/2)

Hope this helps!

### Re: Orbitals on the test

Posted: Mon Oct 22, 2018 11:07 am
Soyoung Park 1H wrote:The pictures that Professor Lavelle had on the presentation on Friday about d orbitals had cones and planes surrounding the orbitals while pictures in google images don't include them. What do they mean?

This just means that these are the nodal planes, or where there is no electron density.