S-orbital and D-orbital

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Jaifreen_Bhangu_3K
Posts: 34
Joined: Fri Sep 28, 2018 12:26 am

S-orbital and D-orbital

Postby Jaifreen_Bhangu_3K » Wed Oct 31, 2018 11:35 pm

When writing electron configurations why is it more favorable to fill the d-orbital instead of the s-orbital?

Arshiya
Posts: 69
Joined: Fri Sep 28, 2018 12:16 am
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Re: S-orbital and D-orbital

Postby Arshiya » Wed Oct 31, 2018 11:43 pm

As the number of orbitals increases, the s and d orbitals become very close in energy with s being slightly lower than d. Therefore, the 4s orbital will fill up first and then the 3d orbital will be filled. However, d becomes favorable when the electron has an uneven amount of electrons. Orbitals like to be either half filled or fully filled in order for the element to be more stable. So, d becomes favorable under those circumstances. For example, Nickel has an electron configuration of [Ar]4s2,3d8. However, in order for the electrons to be more stable a [Ar]3d10 configuration is preferred.

taywebb
Posts: 60
Joined: Fri Sep 28, 2018 12:15 am

Re: S-orbital and D-orbital

Postby taywebb » Sat Nov 03, 2018 8:45 pm

Would the configuration of Ni as [Ar]3d84s2 be considered wrong on a test? Is it always preferred to fill the shell in order to make it more stable?


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