Electron Configurations for 3.9

Moderators: Chem_Mod, Chem_Admin

Alex Nguyen 3I
Posts: 100
Joined: Fri Sep 25, 2015 3:00 am

Electron Configurations for 3.9

Postby Alex Nguyen 3I » Mon Oct 19, 2015 12:23 am

Is there any particular reason why the ground state configuration of both are designated at [Ar] 3d7 and [3d6] respectively? Is it appropriate to leave out the 4s orbital?

Reine Nakamura 1C
Posts: 38
Joined: Fri Sep 25, 2015 3:00 am

Re: Electron Configurations for 3.9

Postby Reine Nakamura 1C » Mon Oct 19, 2015 10:19 am

Because Co2+ and Fe2+ are ions with a positive charge, you start with the electron configuration of the neutral atom and remove 2 electrons. When electrons fill the 4s subshell and begin to occupy the 3d subshell, the 3d subshell has a lower energy than the 4s. Therefore, when you go to remove 2 electrons, they will come from the highest energy/outermost subshell, which is the 4s in this case. It's appropriate to leave out the 4s subshell when writing the electron configurations to acknowledge that those 2 electrons have been removed.

Alex Nguyen 3I
Posts: 100
Joined: Fri Sep 25, 2015 3:00 am

Re: Electron Configurations for 3.9

Postby Alex Nguyen 3I » Mon Oct 19, 2015 12:54 pm

So does the 3d state a higher energy level than 4s until it is "occupied" or does the 4s state always have more energy?

Christopher Ansay 1C
Posts: 28
Joined: Fri Sep 25, 2015 3:00 am

Re: Electron Configurations for 3.9

Postby Christopher Ansay 1C » Thu Oct 22, 2015 4:51 pm

I believe a 4s state is lower in energy than a 3d orbital until the 4s orbital is fully occupied.


Return to “Electron Configurations for Multi-Electron Atoms”

Who is online

Users browsing this forum: No registered users and 2 guests