Electron Affinity

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marisaimbroane1J
Posts: 69
Joined: Fri Sep 28, 2018 12:23 am

Electron Affinity

Postby marisaimbroane1J » Tue Oct 30, 2018 6:49 pm

Why does carbon have a higher electron affinity than nitrogen? Does this pattern stay the same down groups 14 and 15?

AustinGrove3B
Posts: 53
Joined: Fri Sep 28, 2018 12:23 am

Re: Electron Affinity

Postby AustinGrove3B » Tue Oct 30, 2018 8:04 pm

It has to do with the fact that when you add an electron to C, it goes in the 3rd P subshell (previously unoccupied). When you add an electron to N, it has to pair up with another electron in the p shell. The energy released in the C case is larger.

Kelsey Warren 1I
Posts: 60
Joined: Fri Sep 28, 2018 12:15 am

Re: Electron Affinity

Postby Kelsey Warren 1I » Tue Oct 30, 2018 8:25 pm

In its ground state, C has one electron in the px orbital and one electron in the py orbital and an unoccupied pz orbital. When an e- is added, it occupies the previously empty p orbital, which releases more energy than an additional e- in N pairing up with another in the px orbital.


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