elements in 3p block

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Nare Arakelian Dis 3E
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Joined: Thu Jul 11, 2019 12:16 am

elements in 3p block

Postby Nare Arakelian Dis 3E » Sun Nov 03, 2019 11:20 pm

Why are Phosphorus, Chlorine, and Sulfur exceptions to the octet rule when their electron configurations do not have a 3d orbital? Is it just because they are in the third energy level?

Robin Cadd 1D
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Re: elements in 3p block

Postby Robin Cadd 1D » Mon Nov 04, 2019 9:39 am

They do have a 3d subshell, it's just not filled.

Brittany Tran 3I
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Joined: Sat Jul 20, 2019 12:16 am

Re: elements in 3p block

Postby Brittany Tran 3I » Tue Nov 05, 2019 7:36 pm

period 3 elements can utilize their 3d orbital to form expanded octets, but the 3d orbital doesn't have to be occupied, like in the case of P, S, and Cl

Katie Kyan 2K
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Re: elements in 3p block

Postby Katie Kyan 2K » Tue Nov 05, 2019 8:41 pm

If we look at the quantum number for the period 3 elements like P, S, and Cl we see that for n=3, l=0,1, or 2. Even though for the ground state electron configuration, the electrons of the period 3 elements do not fill the d orbital, they have the ability to as we can see from the angular quantum number taking on the possible value of l=2. Therefore, elements in row 3 can have expanded octets and make use of their empty d orbital to hold electrons.

Michelle Xie 2B
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Joined: Sat Aug 17, 2019 12:18 am

Re: elements in 3p block

Postby Michelle Xie 2B » Fri Nov 08, 2019 12:55 am

They are able to use their 3d orbital. They are just normally not filled.

Nuoya Jiang
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Joined: Sat Sep 14, 2019 12:17 am

Re: elements in 3p block

Postby Nuoya Jiang » Fri Nov 08, 2019 10:35 am

Their n=3, which indicates that they are able to have 3d orbitals.

anjali41
Posts: 109
Joined: Fri Aug 09, 2019 12:15 am

Re: elements in 3p block

Postby anjali41 » Fri Nov 08, 2019 11:10 am

Elements in the 3p block actually can have a 3d orbital, but the orbital does not have to be completely filled in the case of some elements.

Nare Arakelian Dis 3E
Posts: 58
Joined: Thu Jul 11, 2019 12:16 am

Re: elements in 3p block

Postby Nare Arakelian Dis 3E » Sun Nov 10, 2019 11:39 pm

Thank you guys for answering! This cleared up a lot for me!

Adelpha Chan 1B
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Joined: Thu Jul 25, 2019 12:15 am

Re: elements in 3p block

Postby Adelpha Chan 1B » Tue Nov 12, 2019 12:06 pm

Nare Arakelian Dis 3E wrote:Why are Phosphorus, Chlorine, and Sulfur exceptions to the octet rule when their electron configurations do not have a 3d orbital? Is it just because they are in the third energy level?

Though themselves do not normally occupy the 3d orbital, n=3 meaning that the d orbital (l=2) is available, therefore allowing for an expanded octet


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