Electronegativity trend exception

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Nick Fiorentino 1E
Posts: 102
Joined: Wed Sep 18, 2019 12:16 am

Electronegativity trend exception

Postby Nick Fiorentino 1E » Sat Nov 02, 2019 9:15 am

Last night in the review session with Lyndon, it was said that Nitrogen has a higher electronegativity than oxygen. Can someone explain why this is?

Caitlyn Tran 2E
Posts: 100
Joined: Fri Aug 09, 2019 12:15 am

Re: Electronegativity trend exception

Postby Caitlyn Tran 2E » Sat Nov 02, 2019 10:11 am

I believe that the reasoning is similar to why Cr and Cu are exceptions when making their electron configuration. All half filled orbitals has a symmetry that makes it more stable than two half filled orbitals and one filled orbital (in the case of N). This stability causes Nitrogen to be able to hold onto its electrons better, thus giving it a higher than expected ionization energy. This is why it is ranked as having a higher ionization energy despite the general periodic trends we learned.

Leyna Dang 2H
Posts: 104
Joined: Thu Jul 25, 2019 12:17 am

Re: Electronegativity trend exception

Postby Leyna Dang 2H » Sat Nov 02, 2019 12:12 pm

Lyndon was talking about an exception to the trend with ionization energy and electron affinity. Electronegativity does not have those same exceptions. O is more electronegative than N.

ahuang
Posts: 52
Joined: Fri Aug 30, 2019 12:17 am
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Re: Electronegativity trend exception

Postby ahuang » Sat Nov 02, 2019 1:19 pm

Oxygen has lower electronegativity because it has an extra electron added to a half full orbital, creating electron-electron repulsion.


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