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electron config in the "d" sublevel

Posted: Sun May 06, 2018 11:42 pm
by Haowen_Liang_3E
For the electron configuration, when we get into an element in the "d" sublevel, why do we do something like "3d10 4s1" instead of "3d9 4s2?"

Re: electron config in the "d" sublevel

Posted: Sun May 06, 2018 11:47 pm
by Adam Yaptangco 1D
I believe that the d subshell must be completely filled first before it can move onto the next one.

Re: electron config in the "d" sublevel

Posted: Sun May 06, 2018 11:49 pm
by JulietOttenberg-1C
Excluding exceptions, the sublevels are filled from lowest to highest energy. The 3d sublevel gets filled before any of the sublevels after it (such as 4p and 5s and 4d) because it has a lower energy

Re: electron config in the "d" sublevel

Posted: Sun May 06, 2018 11:54 pm
by 204750609
I think you fill in the 4s level before the 3d level because the 3d level has a slightly higher energy than the 4s sub level.
https://www.chemguide.co.uk/atoms/prope ... oblem.html

Re: electron config in the "d" sublevel

Posted: Sun May 06, 2018 11:55 pm
by 105012653 1F
If we're finding the electron configuration for, say, an ion with the same amount of electrons, would it also follow the same rule?

Re: electron config in the "d" sublevel

Posted: Mon May 07, 2018 6:45 pm
by Chem_Mod
For ions, find the electron configuration of the neutral atom first. Then add/subtract the electrons from lowest unfilled orbital/highest filled orbital.