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aufbau principle

Posted: Mon Oct 28, 2019 9:51 am
by Sharon Rodriguez 3H
Why does 3d^10 have less energy than 4s^2? Could somebody explain the "switch" in energies that occurs in this area of electron configurations?

Re: aufbau principle

Posted: Mon Oct 28, 2019 10:34 am
by Deana Moghaddas 3E
The electrons are in a lower energy level (3) as opposed to the higher energy level of 4.

Re: aufbau principle

Posted: Mon Oct 28, 2019 8:32 pm
by Leila_4G
So when we draw the orbital configuration, does 4s go in a row below 3d if we are drawing it vertically with the higher energy levels going up?

Re: aufbau principle

Posted: Mon Oct 28, 2019 8:33 pm
by Jasmine Vallarta 2L
I think of it as

3d vs 4s
n=3 vs n=4
n=3 is in a lower energy level

Re: aufbau principle

Posted: Mon Oct 28, 2019 9:21 pm
by ZainAlrawi_1J
Base it purely off the number order,
3d is n = 3
4s is n = 4
4 > 3
3 is at a lower energy level

Re: aufbau principle

Posted: Mon Oct 28, 2019 9:30 pm
by Nyari Muchaka_Discussion 4A
When you go across the periodic table you come across 3d after 4s, however, in terms of energy levels, you go in numerical order so since 3 is before 4, 3d is lower than 4s. Also pretty sure Lavelle wants us to write the configuration in terms of ascending energy levels.

Re: aufbau principle

Posted: Mon Oct 28, 2019 10:45 pm
by Arvind 4G
The 3d is in the energy level of n=3 which has less energy than the 4s which is in the energy level of n=4.

Re: aufbau principle

Posted: Tue Oct 29, 2019 8:45 am
by Ariel Davydov 1C
As for writing out electron configurations, Lavelle said that he prefers us to write 3d before 4s, and the same goes for the f-block and other d-orbitals.

Re: aufbau principle

Posted: Wed Oct 30, 2019 12:07 am
by Omar Selim 1D
There's less energy in the 3rd energy level than the 4th, because of the reality that it takes more energy to maintain stability in the 4th energy level