Workbook Quiz 2 Prep: #9 Which has 2 unpaired electrons?

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Franca Park 3J
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Joined: Fri Sep 25, 2015 3:00 am

Workbook Quiz 2 Prep: #9 Which has 2 unpaired electrons?

Postby Franca Park 3J » Wed Oct 28, 2015 5:57 pm

A. OF+
B. NO+
C. CO+

The answer is A, but I do not understand how to do this problem. I drew the Lewis structures for all of these species, but I don't think that helps. Do I have to do the electron configuration in order to do this problem?

Nathan Danielsen 1G
Posts: 17
Joined: Fri Sep 25, 2015 3:00 am

Re: Workbook Quiz 2 Prep: #9 Which has 2 unpaired electrons?

Postby Nathan Danielsen 1G » Wed Oct 28, 2015 7:52 pm

Lewis structures cannot tell you whether or not an atom has unpaired electrons. To figure that out, one must draw the molecular orbital. In this case, OF+ has 12 electrons, so all the orbitals are filled up until PI*2Px and PI*2Py which each get 1 electron, as they are on the same energy level, and Hund's rule must be applied. From this you can see that OF+ has 2 unpaired electrons.


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