Questions tagged [lewis-structure]

For questions about determining Lewis structures (or their validity) for different chemical species. Do not use this tag if your question is about determining [oxidation-state] or [formal-charges], use the other respective tags instead.

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8
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3answers
9k views

π Bonding in Carbon Dioxide

I am fairly sure the first diagram I drew for carbon dioxide is wrong in terms of showing π bonding. This is because we use a π orbital twice, which isn't possible. The second diagram corrects this by ...
10
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1answer
5k views

Does sulfur and phosphorus expand their octet?

There are many compounds in which the stability of a molecule is not governed by the presence of octet configuration in central atom. In most of the cases the central atom is generally sulfur or ...
21
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2answers
6k views

Which relatively simple molecules violate the octet rule?

I'm learning how to draw Lewis diagrams. Everything I've read emphasizes the octet rule. However, to the best of my knowledge, that rule only applies to elements in the first three periods. On our ...
18
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5answers
78k views

The Lewis structure of HNO3

So I was checking the structure of nitric acid in Wikipedia, however I couldn't quite fathom why it looked like that because it seemed to contradict the following statement: A Lewis structure with ...
10
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2answers
743 views

What is the structural formula of alkali hypohalite: MOX or MXO?

There seems to be an inconsistency in the formula. Somewhere it is written as MOX and in some places, it is written as MXO. This is what Google gives when you search sodium hypochlorite: I think the ...
14
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5answers
12k views

Structure of NO2 compound?

What is the correct structure for the $\ce{NO2}$ compound (not ion)? I always thought it was like: since the negative charge would be residing the on the highly electronegative oxygen, but was ...
11
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4answers
1k views

Does benzene structure stand for a single resonance form or the whole molecule?

It is known that benzene has two main resonance forms Often we still draw benzene molecule as one of them My question is, actually when we draw the lower figure, do we refer to the whole benzene ...
7
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2answers
9k views

Is this a valid structure for the nitrate ion?

Why is the below structure not considered a valid structure for the nitrate ion? Is it because adding a double bond reduces the formal charges present on the nitrogen? Does the above form exist ...
2
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2answers
985 views

Why is hydrogen sulfate put together as it is?

I recently looked up hydrogen sulfate ($\ce{HSO4-}$) to see how it's put together, and found this image of methyl hydrogen sulfate: I'd assume that hydrogen sulfate looks the same, but without the ...
8
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4answers
4k views

Why does stannous chloride occur despite the octet rule?

Shouldn't reaching an octet be any atom's "goal"? However, I've recently learned about cases that are either expanding octets, or have lesser than "enough" electrons for an octet abiding. e.g.: S in ...
7
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3answers
3k views

Why is there a need for resonance?

Why are we able to show structures of compounds with different position of electron, but with same position of them? Shouldn't the structure become unstable due to this? Let's take benzene for the ...
4
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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?...
10
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6answers
28k views

What is the Lewis structure for HClO?

In many sites, I see that they put $\ce{O}$ in the middle, but our teacher said that we should put $\ce{O}$ near the extremity. Which is the best way?
9
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1answer
44k views

What is the Lewis Structure for CO?

In many sites I see that they take $\ce{C}$ with valence 4, bur our teacher takes it with valence 2. With what valence should I take $\ce{C}$?
7
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2answers
13k views

Why is O2 a biradical?

$\ce{O2}$ has a double bond in its normal form. That is $\ce{O=O}$. There are no unpaired electrons in this case are there since there are 2 lone pairs on each oxygen. However 1 resonance structure ...
5
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1answer
51k views

The Lewis structure for NCO-

I was having trouble drawing the Lewis structure for $\ce{NCO^-}$. I found this image online: But why is structure number one preferred over structure number two? Why does carbon prefer to have a ...
5
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1answer
2k views

Why does H bond to S in HSO3?

In the structure of $\ce{HSO3-}$, we see that the H is bonded directly to the S, not to the O's, as would be the case in other oxyacids. Why is this the case?
4
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1answer
2k views

Do atoms react to fill outer shell or 8 valence electrons? [duplicate]

I recall in middleshool chemistry we simply said electron shell configurations were 2,8,8,many which I would have no problems with. But now I'm learning that shells contain $2n^2$ electrons where n ...
2
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1answer
477 views

How to know when electrons will be added onto Lewis Structure from surrounding atoms to become ion?

How do I know when I should add an electron to a single electron? Do I just always do this? I've came across this in the textbook in the form of the amide ion $\ce{NH2}$, among others. It was shown to ...
0
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2answers
4k views

What are the resonance structures for chlorite anion?

What are the possible resonance structures for $\ce{ClO_2^-}$? Assigning one double bond to the structure makes for formal charges of $\ce{O(-1)-Cl(0)=O(0) <-> O(-1)=Cl(0)-O(-1)}$. It appears ...
-2
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1answer
3k views

Is this disaccharide sucrose? [duplicate]

I want to know if the structure I drew is sucrose or an enantiomer of it. The One I Made: The one on internet:
10
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2answers
10k views

Ozone resonance structure: differing opinions

I've always thought that the two-form resonance structure of ozone was the scientific concensus (from Wikipedia]: Then today I found two other opinions. A three-form structure: And a four-form ...
4
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2answers
6k views

Why is Graphene So Strong?

There has been a lot of news about Graphene since its discovery in 2004. And as we are all told it is a revolutionary material which is very strong, conductive and transparent; even in some cases it ...
5
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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 ...
4
votes
1answer
191 views

Is it possible to use the school supplied algorithm to build the Lewis diagram of the iodate ion?

I am upgrading the grade 12 chemistry credit and have to use the school supplied algorithm to build the Lewis diagram of $\ce{IO3-}$ ion. It seems to me that iodine oxidation state in this ion should ...
3
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2answers
2k views

Different possible Lewis structures of peroxymonosulfate anion

I was trying to draw the Lewis structure of $\ce{HSO5-}$ (peroxymonosulfate), so I came up the structure on the left that satisfies the octet rule. Then, I saw that the correct structure is the one on ...
2
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1answer
22k views

Why does Boron only need 6 valence electrons unlike the standard 8?

So I was a bit confused. Hydrogen and Boron seem to be the only outliers to the octet rule. Hydrogen makes sense because it has only one shell and 2 electrons complete its shell. Boron's configuration,...
1
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1answer
3k views

What to do when there is an odd number of valence electrons left on the the central atom?

For example, I'm trying to write the formula for $\ce{NO}$, and $\ce{ClO2}$. The steps my teacher gave me always assume that the central atom has a full valence, or more than full, after the outer ...
6
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1answer
22k views

Structures for NO+ (Nitrosonium)

There are two possible structures for Nitrosonium : In the first structure, there is a +1 Formal charge on Oxygen, whereas, In the second structure, there is a +1 Formal charge on Nitrogen. Q. ...
5
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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 ...
4
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1answer
18k views

What is the correct Lewis structure of diazomethane?

I tried to google and watch YouTube videos on how to write Lewis structures properly, but I can't seem to understand how to do this correctly. My teacher, when class was in session, gave me a set of ...
1
vote
1answer
692 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 ...
1
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0answers
6k views

Hybridisation of POCl3 [duplicate]

I was doing lewis structures and i came across a question asking the structure of POCl3. Here, the answer is a tetrahedral shape with P as central atom connected to 3Cl atoms by a single bond and 1 ...
1
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1answer
26k views

Which atom goes in the middle of a lewis dot structure?

I've read online in multiple sites that the least electronegative atom goes in the middle with the exception of H, which always goes on the outside. However, in the molecule NaCN, C is in the middle. ...
0
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1answer
185 views

What is the structure of Cl₂O₆?

I couldn't find which of these is correct and even someone I asked said there's no general covincement on it, but I'm unsure whether he's correct? I reproduced the second structure a little wrong ...
0
votes
1answer
2k views

Lewis dot structures of CO2

I know the general Lewis dot structure of carbon dioxide is the one where there are two double bonds connecting oxygens to carbon. However the question is, does $\ce{CO2}$ have resonance structures? ...