Electron configuration

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Natallie K 3B
Posts: 61
Joined: Wed Sep 30, 2020 9:51 pm

Electron configuration

Postby Natallie K 3B » Sun Nov 01, 2020 5:06 pm

When writing out electron configurations for elements, does the d orbital come before or after the s orbital?

For example, is the electron configuration of Iodine [Kr]5s24d105p5 or is it [Kr]4d105s25p5?

In high school chemistry, I was taught to write the s orbital first, but the textbook answer key was giving the configurations with the d orbital first increasing in terms of n. Which is the correct way?

Mrudula Akkinepally
Posts: 111
Joined: Wed Sep 30, 2020 9:31 pm

Re: Electron configuration

Postby Mrudula Akkinepally » Sun Nov 01, 2020 5:08 pm

I wrote the s orbital first in high school too. However, I think we are expected to write the d orbital first because it has a lower energy than s.

Sonel Raj 3I
Posts: 90
Joined: Wed Sep 30, 2020 9:48 pm

Re: Electron configuration

Postby Sonel Raj 3I » Sun Nov 01, 2020 5:11 pm

Yeah, I think Lavelle wants us to write the d-orbitals first in this course, going off of energy level. I think he mentioned it in Monday's lecture? Still a little confused on why though, because we also wrote the s-orbitals first in chem.

Pranav Daggubati 3C
Posts: 118
Joined: Wed Sep 30, 2020 9:35 pm

Re: Electron configuration

Postby Pranav Daggubati 3C » Sun Nov 01, 2020 5:35 pm

People sometimes write s first to show the pattern on the p-table and d first to show the energy level

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