Odd number of valence electrons

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Rohan Kubba Dis 4B
Posts: 50
Joined: Sat Aug 17, 2019 12:18 am

Odd number of valence electrons

Postby Rohan Kubba Dis 4B » Sat Nov 02, 2019 10:53 am

I understand that sometimes we are going to be given a molecule and we may not have enough electrons to fill up all the shells. In these cases, with an odd number of electrons, where do we give that extra electron to? In other words, which element gets the extra electron? Does it have to do with electronegativity or some other value?

karinaseth_1A
Posts: 57
Joined: Sat Jul 20, 2019 12:15 am

Re: Odd number of valence electrons

Postby karinaseth_1A » Sat Nov 02, 2019 10:55 am

Put the electron on the atom where it will give it the lowest formal charge. Usually this is the central atom, but you have to calculate formal charges to know which configuration is the most stable.

Goyama_2A
Posts: 69
Joined: Sat Aug 24, 2019 12:17 am

Re: Odd number of valence electrons

Postby Goyama_2A » Sat Nov 02, 2019 10:57 am

The electron is usually placed in a way that would allow our structure to be the lowest energy structure, meaning the least formal charges possible. So, it’s mostly the same as any other situation where you’re trying to figure out the best structure for bonding, except this time you happen to have a free radical.


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