Questions tagged [formal-charge]

For questions about formal charge in any molecule. Do not confuse with [oxidation-state].

Filter by
Sorted by
Tagged with
4
votes
2answers
15k views

Does resonance affect the polarity of the molecule?

Ozone is a resonating structure, is it because of its resonance and bent structure that it is a polar molecule? Or Is it because of the formal charges whereby the formal charges determine the ...
3
votes
1answer
526 views

Why are electrons shared equally when calculating formal charge, but unequally when calculating oxidation state?

When calculating formal charge - electrons are shared equally between the atoms in the bond. When calculating oxidation state - electrons are both given to the most electronegative atom. Why is this ...
23
votes
1answer
17k views

Can metals have a net negative charge

Normal metals like sodium or Calcium have a positive charge as $\ce{Na}^+$ or $\ce{Ca}^{2+}$. Transition metals have a loot of variable oxidation states. Yesterday I read about Iridium in Wikipedia ...
4
votes
3answers
21k views

Identifying coordinate bonds

How can we know whether a compound has a coordinate bond or not? I know that I have to draw the Lewis Structure for the compound. But what to do after that? Is there anything to do with formal charges?...
0
votes
1answer
97 views

How to differentiate the notation of a compounds charge and an anions oxidations state?

I have had the case a few times. Being given something of this form: $$\ce{Cr2O7^2-}$$ How do I know whether the $2-$ is referring to the oxidation of the oxygen anion or the charge of the whole ...
1
vote
2answers
8k views

Partial charges in a covalent bond

My professor stated the following statement: In a covalent bond, there is a presence of a partial charge in the atoms that combine to form a compound. For example in $\ce{H2O}$, since $\ce{O}$ is ...
7
votes
1answer
3k views

Difference between oxidation and formal charge

What is the difference between oxidation number and formal charge? I am confused about the two.
6
votes
1answer
2k views

Formal charges on polyatomic ions

Why is it that sometimes a polyatomic ion's Lewis structure is adjusted to remove the formal charge on the central ion, but sometimes it is not? For example, in the $\ce{I3-}$ ion (triiodide), the ...
2
votes
1answer
2k views

Why don't atoms with expanded valence shells have a formal charge?

I'm working through Chemistry - Principles and Practice, 3rd Edition and I have few complaints so I don't think it's the text. At one point, I was asked to draw the Lewis structure, with formal charge,...
5
votes
3answers
2k views

The definition of formal Charge

Ok, most people including me know that formal charge is just a book-keeping tool. I know how to calculate it, apply it to Lewis structures etc etc. But I am confused in its very basic definition which ...
3
votes
2answers
2k views

Formal Charge of Terminal Atoms

Would the formal charge of terminal atoms differ from the FC of the non-terminal atoms? Say you had a sheet of graphite; inside the network covalent solid all the carbons are bound to one another, ...
1
vote
1answer
696 views

Why does calculating formal charges help us draw correct Lewis structures?

Reading about how to draw Lewis structures, all I know is that formal charge is the charge assigned to an atom in a molecule assuming that electrons are shared equally, regardless of differing ...