E- configuration

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Shibhon_Shepard
Posts: 62
Joined: Wed Nov 15, 2017 3:04 am

E- configuration

Postby Shibhon_Shepard » Sat Nov 10, 2018 6:28 pm

Hi, can someone write like exactly what order we are suppose to write the configuration? because i keep getting mixed answers on whether s or d goes first. thanks

Lauryn Shinno 2H
Posts: 59
Joined: Fri Sep 28, 2018 12:24 am

Re: E- configuration

Postby Lauryn Shinno 2H » Sat Nov 10, 2018 6:39 pm

When you get to period 3, even though the periodic table makes it look like 4s should go before 3d, it goes afterwards because the 3d orbital has less energy than 4s after 4s is filled. However, when doing the diagram using Aufbau's rule, 4s goes before 3d.

Gabriela Aguilar 4H
Posts: 30
Joined: Fri Sep 28, 2018 12:29 am

Re: E- configuration

Postby Gabriela Aguilar 4H » Sat Nov 10, 2018 6:40 pm

If the d- orbital is is full and you have to take away electrons then the d -orbital would be written first followed by the s - orbital because it is more favorable to take away electrons from it. It also depends on what the coefficient is .

Ex: Zn: [Ar] 4s^2 3d^10 ---> would be [Ar] 3d^10 4s^2

I am Sodium Funny
Posts: 65
Joined: Fri Sep 28, 2018 12:26 am

Re: E- configuration

Postby I am Sodium Funny » Sat Nov 10, 2018 9:41 pm

The d-orbital should always come before the s-orbital as long as it is in a lower energy level (e.g. 3d before 4s)


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