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 is it wrong to draw the Lewis structure of a molecule's atoms and then figure out the Lewis structure of that molecule

When drawing for example the Lewis structure of nitrate ion (NO3)^-1 whould it be wrong to draw nitrogen and oxygen separately and then try to figure out the structure of the ion? In that case does ...
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Molecular orbital theory and Lewis structure for dioxygen

I am a bit confused about how molecular bond theory predicts pairings of unbounded electrons. For example, in $\ce{O2}$ there are two pairs of electrons on each oxygen along with the double bond. ...
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How to draw Lewis structures of oxoacids?

I know the method of drawing Lewis structures of compounds containing two atom types such as $\ce{CO2}$ and $\ce{SO3}.$ What is the competent method for drawing Lewis structures of compounds like $\ce{...
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Does the molecule LiF3 exist? [closed]

Can LiF3 exist? (1 lithium and 3 fluorines), and if so, what would the Lewis dot diagram look like?
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A question on Lewis dot structures [closed]

In the image shown is a carboxylate ion, I don't understand why we draw 6 electrons on the oxygen and say it has a formal negative charge on it instead of putting 5 dots to represent it used one of ...
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Efficacy of Intramolecular Friedel-Crafts reaction on =o, c=o bonds of ring structures?

Updated Q: Inquiring to understand the efficacy of intramolecular Friedel-Craft like reaction on stability on the ring structures with =o, c=o bonds. Keen to know if ring structures are challenged ...
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Why does the Lewis structure for NH2 have 4 dots and not 3? [duplicate]

Nitrogen has 5 valence electrons. So I would expect that when bonding with two hydrogens, two electrons would go into those bonds, and three would remain in place on the nitrogen. Yet, all the ...
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What does fractional notation represent in molecular formulas such as SiO4/2 or H2SiO2/2?

I'm going through some papers about HSQ (hydrogen silsesquioxane) and keep seeing this fractional notation being used: HSiO3/2 , SiO4/2 , H2SiO2/2 , H3SiO1/2. Example paper. I understand that the ...
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Potassium permanganate structurre

So I'm learning about Lewis structures for university. I was reading a book written by some teachers from my university and in one exercise they ask us to draw the Lewis structure for potassium ...
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Number of π electrons in all trans-2,4,6-octatrienoic acid

Sketch the Lewis structure of all trans-2,4,6-octatrienoic acid. (a) Consider the delocalized π electrons. Employ the particle-in-a-box model. Drawing on your knowledge about the occupation of ...
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What is the correct Lewis structure of difluorophosphate?

I can draw two possible Lewis structures for $\ce{PO2F2-}$ anion: What is the correct structure and why is the other one wrong?
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Why is carbon dioxide a Lewis acid? [duplicate]

I know this has been asked before, but can anyone explain me in simpler terms? Why is $\ce{CO2}$ a Lewis acid? The carbon atom doesn't have any vacant orbitals to accept a lone pair. How can it be a ...
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Oxidation State of Nitrogen in N2O

If we try to calculate the oxidation state of nitrogen in $\ce{N2O}$ using the familiar algebraic method, we get oxidation state $+1$ for both nitrogen atoms and that's what I found when I looked it ...
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The covalent bond in HCl and the Lewis model

Can the formation of the covalent bond in HCl be explained through the hybridization model? We know for sure that it can be explained by the theory of molecular orbitals. In this way, it would be ...
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Is selenium disulfide polar or non-polar?

So I saw in some internet site that $\ce{SeS2}$ is a polar molecule. When I drew the Lewis structure of the molecule, it showed up as a linear molecule like this: $$\ce{S=Se=S}$$ The electronegativity ...
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Why don't atoms with expanded [duplicate]

My title may be confusing, so let me explain. Let's take the molecule SO2 for example... Above, you can see that the Sulfur atom has 6 electrons from its original valence shell involved in bonding/in ...
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Lewis dot structure of H3NF2 [closed]

Consider a hypothetical compound $\ce{H3NF2}$. What will be its Lewis dot structure? I'm stuck, since Nitrogen cannot exhibit pentavalence, or at least its not stable (unlike phosphorous in $\ce{H3PF2}...
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Where do the three negative oxygens in a phosphate group get their missing electron from?

A video I watched showed the construction of a phosphate group using a Lewis structure. The oxygen with the double bond fills its octet group. The three other oxygens lack an electron. The teacher ...
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Why is Cl2-P-O-Cl an unfavourable structure for POCl3?

Why is the structure $\ce{(Cl)2P - O - Cl}$ unfavourable compared to the two structures in the picture? The latter in the picture and the one I stated both have zero formal charge, so I don't really ...
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2 answers
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Lewis structure of dinitrogen trioxide

I have a confusion related to the structure of $\ce{N2O3}.$ I was taught 1 is the correct one, but I believe 2 is better since it has no formal charge on it. Why is 1 correct and 2 wrong?
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Distribution of negative charges in iodine dioxide difluoride anion [closed]

I was drawing the structure for $\ce{[IO2F2]-}.$ I'm stuck on whether the negative charge should be given to oxygen or iodine.
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Molecular Structure

What's the meaning of the triangle and striped line in this structure of $\ce{H3O+}$: Can someone suggest me a site to learn about this? (I'm quite a novice in chemistry.) Thanks
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Lewis structures and chemical-compound formulas [closed]

In the Lewis structures listed below, M and X represent various elements in the third period of the periodic table. Write the formula of each compound using the chemical symbols of each element: a. b. ...
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Correct representation of Lewis structure for sulphate ion

sulphate ion has tetrahedral geometry as predicted by VSEPR theory; the four S-O bonds are indistinguishable and have the same bond order, so the Lewis structure is better represented avoiding S=O ...
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How to draw the structure and find the oxidation number of Phosphorous in H2P2O7 [closed]

Find the Oxidation number of Phosphorus in $\ce{H2P2O7^2-}$. So I thought of drawing the lewis structure to find the oxidation numbers. Because I wasn't sure if Oxygen was bonded to a Hydrogen or not. ...
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Fastest way to determine if molecule has resonance structures [closed]

I came across this old exam problem: For which of the following choices, is every molecule a resonance hybrid with resonance structures? A. $\ce{SO2},$ $\ce{NH3},$ benzene B. $\ce{SO3^2-},$ $\ce{NH3},...
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Can methanol act as a ligand? [closed]

As methanol is both a lewis acid and a lewis base, the lewis base part suggests that it can act as a ligand as many bases are. So, is methanol a ligand? And what is the reason behind it?
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What is the correct electron dot notation of carbon?

My book says that the dot notation for Lewis structure of carbon has 2 possible ways: two dots on the right, one on the top, one on the left one dot on all four sides Why are both of these correct? ...
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Why dosen't No2 form according to the octet rule?

Supposedly every atom that is in the second period of the periodic table has to obey the octet rule, this means that they have to be surrounded by 8 electrons (or so I was taught). Studying resonance ...
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1 answer
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lewis structure of O3 [duplicate]

This is my first question, sorry if I don't know how to write a good question. why is O3 shaped like this?: and not shaped like each Oxygen molecule is connected to two other molecules? (i did not ...
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Can this sp2 lone pair resonate?

In methyl isocyanate, $\ce{CH3CNO}$, shown below, it seems that the nitrogen lone pair can resonate with the carbon oxygen double bond, generating a resonance structure something like acetonitrile ...
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Preferred Lewis structure for sulphate anion and XeO4 [closed]

In a section reviewing Lewis structure, the textbook Atkins' Physical Chemistry, 10th Edition, by Atkins, Paula, and Keeler, gives the following illustration of hypervalence and octet expansion: I ...
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What is the Lewis structure of the azide ion?

On a chemistry homework, we're asked to draw the Lewis structure of $\ce{N3-}$. My answer: Nitrogen ordinarily has five electrons in its valence; $\ce{N-}$ has six. This makes a total of 16 ...
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Why are only two bond structures considered for ozone and not three? [duplicate]

We were taught in chemistry that: Formal charges can be determined by drawing the Lewis dot structure, then subtracting the nonbonding electrons and half of the bonding electrons from the number of ...
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Lewis Structure of OF+

Would the Lewis Structure for OF+ be drawn so that the more electronegative atom has the more negative formal charge, or would it be drawn to satisfy the octet rule? Here are my thoughts thus far: ...
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1 answer
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Finding the central atom of N2O

Why do all structures of $\ce N_2\ce O$ have Nitrogen as their central atom? Can we not draw a lewis structure with Oxygen as the central atom with 2 double bonds to the two nitrogens? This will still ...
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Lewis Structures and electron distribution with oxygen atom

I am a novice in chemistry. I don’t understand the way Lewis structure and how electrons are shared between elements. For instance As we know, Oxygen has six valence electrons that means it has ...
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-1 votes
1 answer
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Drawing bicarbonate ion in different way [closed]

I don't know why can't I draw $\ce{[HCO3]-}$ like that: I tried to draw it like that and checked everything. I checked formal charge and all was good. Why they draw it OH I know its also alright but ...
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What is the Lewis dot structure for ozone? [duplicate]

Currently I studying about the Lewis dot structure for different compounds and my textbook says that the Lewis structure for ozone may be drawn as(as shown in the image): And then it goes on to ...
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Understanding the structure of NCS⁻

Predict the most preferable structure of $\ce{NCS-}.$ $$\Large\underset{(\textbf{1})}{\ce{(:\!\!\overset{\huge.\!\!.}{N}=C=\overset{\huge.\!\!.}{\underset{\huge.\!\!.}{S}})-}}\qquad\underset{(\textbf{...
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Provide a condensed structure for the following compound [closed]

I keep getting, (CH3)3CCH2CH2CHNH2CHCHCH3. However, the homework system keeps counting it as incorrect, and I don't know what part is incorrect. Thanks for the help!
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Is bonds in CO is all 3 coordinate bonds or 2 covalent and 1 coordinate bonds?

Below image is as available in India's Class 11 NCERT Chemistry book vol 1 Page 104. I am confused as it states all 3 bonds are kind of coordinate bonds. Should it not start with 2 covalent bonds and ...
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Electrons distribution of oxygen atoms in ozone [closed]

While dealing with the Lewis structure for ozone, most of the explanations show the electron distribution around the 3 oxygen atoms with a single and double bond. But if you count the number of ...
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Formal charge: size vs electronegativity?

My question is why size is not taken into consideration when deciding major contributors of resonance structures, particularly: why is the formal charge always assigned to the most electronegative ...
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2 votes
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Bonding in the nitrate anion [duplicate]

Hi so I was studying chemical bonding where i encountered a problem which is stated below. When we talk about ${NO_3}^-$ we draw its structure as following But the thing which I dont understand is ...
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Lewis structure of CN radical

I need to draw the Lewis formula for $\ce{CN}$. However, I am not sure how to draw the single free electron. My idea would be as follows: $$\Large\ce{\llap{·}C#N\rlap{:}}$$ Does that make sense?
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2 votes
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Bond angle and bond lengths in Arginine

Based on the Lewis structure of arginine, the terminal primary amine attached to the guanidine group seems to be $\mathrm{sp^3}$ hybridized and trigonal pyramidal. Also, in quantum mechanical ...
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Why is the structure of HNO3 have a central atom rather than being linear?

Why is the structure of $\ce{HNO3}$ have a central atom rather than being linear? I know formal charges need to be reduced as much as possible, and if there was a structure with two oxygens and a ...
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In the Lewis structure for barium fluoride, why does barium lose its valence electrons?

I searched for $\ce{BaF2}$ Lewis structure, and found out that the Barium atom loses its 2 valence electrons to form $\ce{F- Ba^2+F-}$. Before seeing it I thought each of $\ce{Ba}$'s valence electrons ...
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Why isn't O=N-O-O the best lewis structure for NO3-?

I'm practicing lewis structures and I'm stuck on the one for NO3 -1 (nitrate ion). I understand that N has to be the central atom because it is the least electronegative, but I'm confused why all the ...
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