## Extra electrons

Emily Orozco L4
Posts: 22
Joined: Fri Sep 28, 2018 12:29 am

### Extra electrons

When drawing extra electrons in the Lewis Structure, what is the maximum number of electrons you can add to an element with an extended octet?

Maharsh Patel 4E
Posts: 18
Joined: Fri Sep 28, 2018 12:27 am

### Re: Extra electrons

There is not a maximum amount of electrons that can be gained or lost by an atom, however, it would not be favorable to add 6 electrons to a Beryllium atom to get the octet. It would be easier for the atom to lose 2 electron to get this octet. For Oxygen, it would be the opposite. It is not favorable for the Oxygen atom to lose 6 electron to reach the octet, so it gains 2 electrons to get the octet instead.

Elias Omar 1G
Posts: 52
Joined: Fri Sep 28, 2018 12:17 am

### Re: Extra electrons

If I'm understanding your question right, your asking what's the greatest number of atoms a central atom that's part of an expanded octet, where there are more than 8 valence electrons, can have. Most importantly, expanded octets have enough electrons to keep all atoms at the lowest possible energy for stability reasons. I think 10 is the maximum due to d orbitals, which cause expanded octets, having 10 electrons in them.

aisteles1G
Posts: 117
Joined: Fri Sep 28, 2018 12:15 am

### Re: Extra electrons

A good formula I found for the number of lone pairs of electrons on the central atom is LP= total Valence- 8*(number of other atoms that are not central) all over 2. So for example: ICl4 (-), total valence is 7+7(4)+1= 36. the central atom is I and there are 4 additional atoms that will be connected to it so by plugging into the formula you get; 36-8(4)/2= 2 Lone pairs of electrons on the central atom so now you know I will have 4 bonds and 2 lone pairs on it in the lewis structure. Hope this helps!