Exceptions to Electron Affinity

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Bianca Barcelo 4I
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Exceptions to Electron Affinity

Postby Bianca Barcelo 4I » Sun Nov 04, 2018 1:44 pm

Hi, I was wondering what were the exceptions to electron affinity that we had to know?

905109118
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Joined: Mon Oct 01, 2018 12:16 am

Re: Exceptions to Electron Affinity

Postby 905109118 » Sun Nov 04, 2018 2:16 pm

Bianca Barcelo 1G wrote:Hi, I was wondering what were the exceptions to electron affinity that we had to know?


This exception rule is actually orbital filling rule. For two electrons to be in same orbital they need to have different spins (Pauli exclusion principal). This electron pairing requires additional energy and thus it is easier to add electrons if there are free orbitals. When element has a half-filled p sublevel all 3 orbitals have one electron and pairing takes place (difference between energy levels of 2p and 3s is greater than electron pairing energy).


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