Energy of spdf orbitals

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Joseph Saba
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Joined: Thu Jul 11, 2019 12:16 am

Energy of spdf orbitals

Postby Joseph Saba » Tue Oct 22, 2019 8:11 pm

Why is it that for multi-electron atoms, that the electrons placed in 2s are lower energy-wise than electrons in the 2p of the same atom? Is it because of electron shielding?

Daniel Honeychurch 1B
Posts: 56
Joined: Thu Jul 11, 2019 12:15 am

Re: Energy of spdf orbitals

Postby Daniel Honeychurch 1B » Tue Oct 22, 2019 10:01 pm

Yeah, it has to do with shielding. In hydrogen (one electron), 2s and 2p have the same energy when the electron is excited. However, when there are multiple electrons, the 2s sub-shell has a slightly lower energy than 2p.

Brooke Yasuda 4B
Posts: 51
Joined: Sat Jul 20, 2019 12:17 am

Re: Energy of spdf orbitals

Postby Brooke Yasuda 4B » Wed Oct 23, 2019 12:17 am

Even thought they are in the same shell, n = 2, they are in different subshells. The 2s subshell provides slight electron shielding to the 2p subshell which means that the effective nuclear charge is not felt by the 2p electrons as strongly.

505106414
Posts: 55
Joined: Wed Sep 18, 2019 12:17 am

Re: Energy of spdf orbitals

Postby 505106414 » Thu Oct 24, 2019 1:42 pm

Can someone explain what a shell is vs a subshell?

705198479
Posts: 53
Joined: Wed Sep 18, 2019 12:20 am

Re: Energy of spdf orbitals

Postby 705198479 » Thu Oct 24, 2019 1:45 pm

how do I know how many bonds or "dots" go on the ion in the lewis structures

romina_4C
Posts: 50
Joined: Thu Jul 11, 2019 12:17 am

Re: Energy of spdf orbitals

Postby romina_4C » Thu Oct 24, 2019 1:53 pm

705198479 wrote:how do I know how many bonds or "dots" go on the ion in the lewis structures


The number of dots on an atom is the same as the number of valence electrons that the atom has. So for carbon, for example, you would draw four dots as it has four valence electrons.

Anvi Brahmbhatt 4A
Posts: 51
Joined: Wed Sep 18, 2019 12:21 am

Re: Energy of spdf orbitals

Postby Anvi Brahmbhatt 4A » Thu Oct 24, 2019 1:53 pm

705198479 wrote:how do I know how many bonds or "dots" go on the ion in the lewis structures

Count the number of valence electrons!

705198479
Posts: 53
Joined: Wed Sep 18, 2019 12:20 am

Re: Energy of spdf orbitals

Postby 705198479 » Thu Oct 24, 2019 2:01 pm

is there a rule that restricts a sub shell ? is it important to remember for this class?

MinuChoi1G
Posts: 45
Joined: Wed Sep 18, 2019 12:15 am

Re: Energy of spdf orbitals

Postby MinuChoi1G » Thu Oct 24, 2019 2:14 pm

Can someone explain what a shell is vs a subshell?


The shell is the n quantum number (broadest division of electrons in an atom). Shells correspond to the rows in the periodic table.
The subshell is the s-p-d-f classification of orbital groups (quantum number l.) Shells are divided into subshells (3s, 3p, 3d).

Robert Tran 1E
Posts: 58
Joined: Thu Jul 11, 2019 12:15 am

Re: Energy of spdf orbitals

Postby Robert Tran 1E » Thu Oct 24, 2019 2:43 pm

As "l" (the number corresponding to the orbital) increases, the orbitals become increasingly less likely to penetrate the nucleus. Since the electrons spend more time further from the nucleus as l increases, they also experience more repulsion from other electrons. This means that the energy level will increase slightly as the value of l goes up.

Kassidy Ford 1J
Posts: 49
Joined: Sat Aug 17, 2019 12:16 am

Re: Energy of spdf orbitals

Postby Kassidy Ford 1J » Fri Oct 25, 2019 1:25 pm

705198479 wrote:is there a rule that restricts a sub shell ? is it important to remember for this class?


you should know how many electrons each shell can hold; the s shell can only hold 2, p holds 6, d holds 10 and f holds 14

ranqiao1e
Posts: 51
Joined: Sat Sep 14, 2019 12:15 am

Re: Energy of spdf orbitals

Postby ranqiao1e » Fri Oct 25, 2019 6:39 pm

505106414 wrote:Can someone explain what a shell is vs a subshell?


An energy shell is represented by n, while sub shells are spdf.


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