Quantum Numbers

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Harjot Manku 1C
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Joined: Fri Sep 20, 2013 3:00 am

Quantum Numbers

Postby Harjot Manku 1C » Sun Jul 09, 2017 10:49 pm

If the n (principle quantum number) is 3, then l (angular momentum quantum number) is 2. Which is a d-orbital. Where is the d oribtal when you have something like a 3s3p^3?

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Re: Quantum Numbers

Postby Chem_Mod » Mon Jul 10, 2017 11:58 am

It's present, but just not occupied for the instance you provided.

Since orbitals are filled from lowest energy to highest energy, and 3d orbitals are higher in energy than 4s ones, 4s ones are occupied first.

Joshua Xian 1D
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Re: Quantum Numbers

Postby Joshua Xian 1D » Wed Oct 18, 2017 11:45 am

Why is the ms quantum number ±1/2? (How did people decide on the number 1/2 and not some other number?)

Ya Gao
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Re: Quantum Numbers

Postby Ya Gao » Wed Oct 18, 2017 8:56 pm

To the question about d orbital, 3d orbital comes after 4s orbital. About where different orbitals are, you can refer to the energy level of different orbitals on page 43. About why electron spin is +-1/2, I believe the values are derived from experiment... but exactly why +- 1/2, I have no idea :(

Sonja Kobayashi 1H
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Joined: Fri Sep 29, 2017 7:04 am

Re: Quantum Numbers

Postby Sonja Kobayashi 1H » Thu Oct 19, 2017 10:27 am

I believe that it is +1/2 snd -1/2 because the signs represent the orientation of the spinning electron. The negative indicates that the electron is spinning downwards while the positive 1/2 represents the electron spinning upwards. I hope that helps!

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