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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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Why (SO4)^2- does not create 4 double bonds

I looked this question up and still couldn't understand. Why, in $\ce{SO4^2-}$ don't the 4 oxygens create double bonds. In that case the all the oxygens will have 0 formal charge while the sulfur ...
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0answers
45 views

Lewis structure of H3PO2

Here I have shown what I think should be the possible structure. The formal charges are okay and the inert pair effect has also been accounted for as down the group in group 15 +3 oxidation state ...
4
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4answers
297 views

Structure of pyrophosphorous acid

What is the structure of pyrophosphorous acid? I asked this question here because the answer which I found on web and other resources are inconsistent which each other. For example, following data is ...
0
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1answer
38 views

Expanded structure formula and Lewis dot structure, whats the difference?

I am teaching my self the basics of chemistry and I have done lewis dot structure before. Right now I am going into carbon chemistry which often use structure formulas to represent compounds. There is ...
1
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0answers
17 views

How to rationalise the resonance structures of nitrogen dioxide?

The following image depicts resonance in $\ce{NO2}$ molecule: I don't know if it is obvious or not, but I'm puzzled by this structure. I've read about the structure of the $\ce{NO2}$ compound, but it ...
2
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0answers
61 views

Linear algebra in Lewis structures?

In general, I have come across a phenomenon in chemistry where solutions to certain types of problems can often seem frustrating when trying to work out by hand, as they seem to depend on each other ...
0
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0answers
54 views

Oxidation state of N in NO from resonance

I know from a textbook that nitrogen has an oxidation state of +II in NO, and this is easily verified if O is assigned -II. However, if one looks at the resonance structure and assigns covalent ...
5
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3answers
84 views

How to identify the most stable Lewis adduct of boron trichloride?

Which of the following is the most stable Lewis acid–base adduct? (a) $\ce{H2O\bond{->}BCl3}$ (b) $\ce{H2S\bond{->}BCl3}$ (c) $\ce{H3N\bond{->}BCl3}$ (d) $\ce{H3P\bond{->}BCl3}$ ...
2
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0answers
144 views

What studies show that d orbitals don't play an important role in covalent bonding? (> period 2 elements) [closed]

Take a look at all the following molecules: $\ce{SO3^{2-}}$, $\ce{SO2}$, $\ce{SO4^2-}$, $\ce{PF5}$ and many more you can add. In all these there is a controversy of one of these two types: Is formal ...
3
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1answer
168 views

How can I interpret the CH4+ structure?

I am trying to teach myself about Electron Ionization, and am very confused about the formation of the CH4+ Ion. Do the dotted lines between the C and the H, and between the two Hydrogens indicate a ...
7
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1answer
172 views

Lewis structure for magnesium diboride

What is the Lewis structure for $\ce{MgB2}$? I just read that it is a superconducting material (up to a relatively high critical temperature, 39 K) and am wondering if this has to do with its ...
0
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0answers
428 views

Why isn't N2O3 linear? [duplicate]

The $\ce{N_2O_3}$ molecule is shown to be branched, as so: Here, the formal charge of the left-most $\ce{N}$ atom is 1, and the formal charge of the bottom-left $\ce{O}$ atom is -1. However, a linear ...
0
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0answers
79 views

Why doesn't the arsenate ion have two double bonds?

The commonly described arsenate anion has a double bond between the arsenic atom and one of the oxygen atoms. This makes the arsenic ion have a formal charge of 0, and all of the oxygens have a formal ...
1
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0answers
486 views

Lewis structure of ClO radical

The commonly shown structure of the ClO radical described here has a single bond between the chlorine and oxygen atoms. In that structure, chlorine has a formal charge of 1, and oxygen has a formal ...
0
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1answer
118 views

What is the lewis structure of NO [duplicate]

I am a bit confused about the lewis structure of $\ce{NO}$ The answer from my worksheet is $\ce{N=O}$ with nitrogen having a free radical. But I drew the structure as N triple bonded to $\ce{O (:N#O:)}...
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0answers
368 views

What is the Lewis dot diagram for molybdenum and cerium? [closed]

How do I draw a Lewis diagram for $\ce{Mo}$ and $\ce{Ce}$? I am a bit confused since they are transition metals. Attempt The outer electron configuration for $\ce{Mo}$ is $\ce{5s^1 4d^5}$. The number ...
2
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0answers
72 views

Question about resonance structures [duplicate]

I stumbled upon an exercise asking to draw the resonance structure of $\ce{SO4^{2-}}$. We can choose between the resonance structures by calculating the formal charges and by checking which one gives ...
2
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1answer
330 views

How can chlorine have 10 electrons around it in chlorine trifluoride?

I'm relatively new to chemistry, and while doing some exercises about $\ce{ClF_3}$ I tried to draw where the electrons are. I checked Google and got this: How is this structure possible? From what I'...
0
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1answer
119 views

Structure of PH4Br [closed]

What is the structure of PH4Br? I wanna know which atom is bonded to which. Does all five atoms are directly bonded to phosphorus?
4
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2answers
2k views

Is SbF5 symmetrical?

SbF5 forms a trigonal bipyramidal shape. There are polar bonds present and I assumed that it is non polar because of it's molecular geometry. However, The molecule itself is not entirely symmetrical (...
0
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2answers
822 views

Rules to identify the most stable resonance structures

While studying resonance from this Chemistry LibreTexts article, I found the rules to follow in order to decide which structure is the most stable. Among them: The structure with the least number of ...
0
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2answers
5k views

Lewis Structure For H2SO4

When I was drawing the lewis structure for $\ce{H2SO4}$ I got this configuration, now I know this isn't the best configuration but I don't see whats wrong with it. The number of valence electrons is ...
5
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1answer
520 views

Where do the lone pairs go in the “true” resonance structure?

Consider the "true" resonance structure of $\ce{CO3^2-}$: The bottom diagram leaves out the 2 lone pairs, so 4 electrons disappeared in the bottom image as compared to the top one. Are these ...
4
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1answer
807 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 ...
0
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1answer
564 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? ...
0
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1answer
15k views

Lewis Structure of SO2 [duplicate]

What is the structure of SO2? I have seen two different ways the Lewis Structure is written: The formal charges of the SO2 with the single bond and a double bond is larger than the SO2 with two ...
1
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1answer
387 views

Chemical structure of xenon heptafluoride anion

When $\ce{XeF6}$ acts as a fluoride acceptor, $\ce{XeF7-}$ is formed. What is the hybridisation, geometry, and shape of $\ce{XeF7-}$?
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0answers
46 views

How can chlorine form ClO2? [duplicate]

Doesn't it have only have one bonding electron? Then how can it bond with 2 oxygens? The Lewis structure doesn't make much sense to me.
11
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2answers
449 views

Misleading features of Lewis Dot Representation

Today I had an embarrassing experience when I sat to help my nephew learn Lewis' Dot Representation and realized that I actually don't get it at all. I have a physics background and always thought ...
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votes
1answer
495 views

Difference in bond orders between formaldehyde and carbonate [closed]

So I am asked to find the bond order for both of them. I drew the correct Lewis structure, and there's one C-O double bond (and 2 other single bonds). I determined the bond order in CO3 (2-) to be 1....
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votes
1answer
115 views

Major contributor for resonance [duplicate]

I was doing some practice problems, and apparently 6 is the main contributor, due to having all full octets, but I'm not seeing how the oxygen with the + formal charge has a full octet in this case. I ...
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1answer
264 views

Polarity of symmetric Lewis structure [closed]

Why is $\ce{CF2Cl2}$ polar? The Lewis dot structure shows the molecule as being symmetric. Wouldn't that make it nonpolar?
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0answers
157 views

Does moving 2 sets of pi bonds/lone pairs in single resonance structure make conceptual sense?

I don't know how to phrase this better, but can a resonance structure have 2 sets of pi bonds/ lone pairs moved? So 4 total arrows drawn.This is happening on some very big molecules in my homework. ...
2
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1answer
817 views

How to identify lewis acids and bases

What is the general methodology to identify Lewis acids and bases in an acid base reaction? Do we need to draw structures to identify which species is the electron donor and which one the acceptor, or ...
4
votes
1answer
943 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 ...
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1answer
368 views

Which of the following Lewis Structures is NOT correct? [closed]

Which of the following Lewis Structures is NOT correct?
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1answer
359 views

The MO and unpaired electrons

I am learning molecular orbital in general chemistry. I have come across this question that asks me to show that the Lewis structure of $\ce{O2}$ is actually an excited state when viewed in terms of ...
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1answer
2k views

AP Chemistry Practice exam [closed]

It's starts off the question with "Propanoic Acid, $\ce{C2H5COOH}$, is an organic acid that is a liquid at room temperature. An incomplete Lewis diagram for the propanoic acid molecule is provided in ...
3
votes
2answers
392 views

Why does this compound have two benzene rings? [duplicate]

If we look at carbons 1 and 2, they have 5 electrons. 3 are directly involved in bonding, and 2 are involved in delocalisation to create the 2 benzene rings. This would mean that they had 5 valence ...
0
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1answer
532 views

Why is arsenic trichloride more likely to be polar than aluminum trichloride?

According to my chemistry teacher, $\ce{AsCl3}$ is more likely to be polar than $\ce{AlCl3}$. Why is this? As I understand it, the difference in electronegativity is what makes a compound more or less ...
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2answers
454 views

How to calculate formal charge?

I am trying to understand formal charge and how it is being calculated. I have copied the image from organic chemistry as a second language below: How do I calculate formal charge? In the book formal ...
3
votes
1answer
160 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 ...
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1answer
287 views

Lewis Structure of Fe4(SiO4)3

I'm a first year university student and am working on a paper regarding factors that affect how far an asteroid will penetrate into the Earth's atmosphere before exploding. One of the factors I came ...
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0answers
65 views

Valid resonance contributors for 2-methylthiazole [duplicate]

There's a problem from an old exam that I was trying to do. The original structure is given on the left and they want all the possible resonance forms that have closed-shell atoms (octet for S) and ...
1
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0answers
4k 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 ...
2
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0answers
1k views

How can the formal charge of the B in the Lewis structure of BF4(-) ion be minus one?

How can the formal charge of the $\ce{B}$ in the lewis structure of $\ce{BF4-}$ ion be minus one ? I draw the lewis structure of $\ce{BF4-}$ ion such like the following: I put $\ce{B}$ in the ...
0
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1answer
664 views

Lewis structure for SO4 (2+)

This was a question on a review sheet for Lewis structures. Now I could draw $\ce{SO4^2-}$ with no issues, but I can't make sense out of $\ce{SO4^2+}$ because I can't even make bonds to all $\ce{O}$ ...
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1answer
237 views

Are Lewis Structures the same throughout solids, liquids, and gases?

For example, is the lewis structure for water constant even when it is in a solid, liquid, or gas phase?
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2answers
824 views

Why is HCN not a Base and why does HNC does not dimerise?

We know that species that have a lone pair of electrons are Lewis bases (like ammonia). The structue of $\ce{HCN}$ is $\ce{H-C#{N:}}$; nitrogen has a lone pair of electrons and it is still acidic. Why?...
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2answers
168 views

Nitroxyl anion electron structure

Is the $\ce{NO-}$ a radical species? If so, can someone please explain why because $\ce{NO}$ has an odd number of electrons (11), so adding an additional electron would give 12 valence electrons and ...