The order for s,p,d

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Bijal Luhar
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Joined: Fri Apr 06, 2018 11:03 am

The order for s,p,d

Postby Bijal Luhar » Tue May 01, 2018 1:23 pm

In high school I was always taught that we go from s to p to d and thats how we would write the electron configuration, which makes sense because that's the order you go in when looking at a periodic table when determining electron configuration.

Why in this class are we changing the order from s,p,d to d,s,p.

Can someone explain this?

Bryan Jiang 1F
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Joined: Fri Apr 06, 2018 11:03 am
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Re: The order for s,p,d

Postby Bryan Jiang 1F » Tue May 01, 2018 1:43 pm

Electron configuration should be ordered primarily by increasing order of shells, the principle quantum number n. Given this, we also know that when we start including the d-orbitals in the electron configuration, the highest shell in which the d-orbitals reside in “lags” behind the highest shell in which the s- and p-orbitals reside in by 1 shell. As a result, it effectively seems that we would be ordering electron configuration in a d,s,p order, but really we are ordering electron configuration by the shells, the principle quantum number n.

An example from lecture is ground state scandium, Sc as [Ar] 3d¹ 4s². It seems that we are ordering in a d,s,p order (d¹ came before s²), but the mindset should be that we are ordering configuration by increasing order of shells, n (3 came before 4).

Valeria Viera 1B
Posts: 60
Joined: Fri Apr 06, 2018 11:05 am

Re: The order for s,p,d

Postby Valeria Viera 1B » Tue May 01, 2018 6:14 pm

In my step up section someone said that the order is dsp as well (ex: 3d10 4s2 4p6). However they also said that if the d orbitals are not full then the order is actually sdp (ex: 4s2 3d5 instead of 3d5 4s2).

Is that right? If so doesn’t that go against the whole writing from least to highest energy?

KristinaNguyen_1A
Posts: 30
Joined: Fri Apr 06, 2018 11:04 am

Re: The order for s,p,d

Postby KristinaNguyen_1A » Tue May 01, 2018 10:31 pm

Like someone said above, the order depends on the energy level. d starts with level 3 but is the same row as when s and p have the energy level of 4. Because of the difference in energy levels, d will go before s and p. The order of s and p does not change since they are in the same energy level.


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