Why does 4s fill up before 3d?

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MariaJohn1D
Posts: 50
Joined: Wed Nov 08, 2017 3:01 am

Why does 4s fill up before 3d?

Postby MariaJohn1D » Sun Apr 29, 2018 6:32 pm

Why does the 4s orbital fill up before 3d orbital other than that it's at a "lower energy level"?

Vivian Gonzalez 1A
Posts: 30
Joined: Fri Apr 06, 2018 11:03 am

Re: Why does 4s fill up before 3d?

Postby Vivian Gonzalez 1A » Sun Apr 29, 2018 6:52 pm

The only reason I can think of is since the 3d state is higher in energy than the 4s state, the 4s state would fill up faster because it would take less energy.

KateCaldwell 1A
Posts: 43
Joined: Fri Apr 06, 2018 11:02 am

Re: Why does 4s fill up before 3d?

Postby KateCaldwell 1A » Sun Apr 29, 2018 7:04 pm

Vivian Gonzalez 1A wrote:The only reason I can think of is since the 3d state is higher in energy than the 4s state, the 4s state would fill up faster because it would take less energy.

I would have to agree with Vivian as the 4s electrons are lost first during ionization. The electrons lost first, have the highest energy level which is al the electrons furthest from the nucleus. Since they are the furthest from the nucleus, they are also the easiest to fill up.

salvadoralvizo1J
Posts: 29
Joined: Fri Apr 06, 2018 11:01 am

Re: Why does 4s fill up before 3d?

Postby salvadoralvizo1J » Sun Apr 29, 2018 8:17 pm

Is there any particular reason as to why orbitals are named the way they are, or where these letters chosen at random?

Lily Emerson 1I
Posts: 27
Joined: Fri Apr 06, 2018 11:02 am

Re: Why does 4s fill up before 3d?

Postby Lily Emerson 1I » Sun Apr 29, 2018 8:51 pm

s, p, d, and f are short for sharp, principle, diffuse, and fundamental based on the type of spectral lines the orbitals make


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