Ground State Scandium

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Rain Taganas 1J
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Joined: Fri Sep 29, 2017 7:05 am

Ground State Scandium

Postby Rain Taganas 1J » Tue Oct 24, 2017 11:51 pm

In lecture, Dr. Lavelle said that the ground state of scandium is Sc: [Ar] 3d1 4s2, and not Sc: [Ar] 4s2 3d1. Why is it this order?

Cali Rauk1D
Posts: 51
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Re: Ground State Scandium

Postby Cali Rauk1D » Wed Oct 25, 2017 9:11 am

the 3d1 shell has lower energy than the 4s2 because the 3d1 has unpaired electrons so you write it before.

Riya Pathare 2E
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Re: Ground State Scandium

Postby Riya Pathare 2E » Wed Oct 25, 2017 1:33 pm

From Scandium forward we always write the 3d shells before the 4s shells because they will have lower energy since their principal quantum number is 3 not 4.

Madelyn Gehrich 1E
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Re: Ground State Scandium

Postby Madelyn Gehrich 1E » Wed Oct 25, 2017 6:36 pm

Keep in mind that in the row on the periodic table containing the 4s and 4p orbitals (the fourth row), the d-block begins in this row as well and is labelled differently than the s and p orbitals. The 4th row on the table goes in the order 4s, 3d, then 4p chronologically, but since 3d is located in the 4s row it must go before the 4s orbital because it starts with a lower shell number. Stay focused on the numbers preceding the orbital type instead of the exact order when you read the periodic table left to right.

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