Electron Configuration of Scandium

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Jared Pagal 1J
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Joined: Fri Apr 06, 2018 11:04 am

Electron Configuration of Scandium

Postby Jared Pagal 1J » Wed May 02, 2018 7:49 pm

So in lecture on Wednesday, Prof. Lavelle used Scandium as an example to write out the electron configuration. His answer was Sc: [Ar]3d^1 4s^2. However, when I use the Aufbau principle, I get Sc: [Ar]4s^2 3d^1

Is the 3d orbital always going to be a higher energy level than 4s?

Jessica Urzua-1H
Posts: 37
Joined: Tue Nov 14, 2017 3:01 am

Re: Electron Configuration of Scandium

Postby Jessica Urzua-1H » Wed May 02, 2018 8:39 pm

On the periodic table, the s-block comes before the d-block, so the d-orbitals appear to have higher energy than s-orbitals. However, when it comes to multi-electron atoms after the atomic number 20, the 4s state is higher than the 3d state. It is just an exception that is known for electron configurations. I hope this helps!!

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