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How to Calculate the Formal Charges for N2O (Nitrogen dioxide)

20 525 views | 3 Jan. 2019

In order to calculate the

In order to calculate the formal charges for N2O we'll use the equation:

Formal charge = [# of valence electrons] - [nonbonding val electrons] - [bonding electrons / 2]

The number of valence electrons for the atom of interest is found on the Periodic Table.

We find the number of bonding and nonbonding electrons from the Lewis Structure for N2O.

How to draw the N2O Lewis Structure: https://youtu.be/ZlHIQhJlWNs

Nonbonding valence electrons are those around the atom of interest that are not involved in chemical bonds (they aren't being shared with another atom).

Bonding valence electrons are the ones shared between atoms. We'll divide this number by two.

For more help with chemical bonding and formal charge visit http://www.Breslyn.org

Some things to note about N2O Formal Charges:

- Formal charge is different from the oxidation number!

- If you can exceed the octet rule for the central atom it's a good idea to check the formal charges.

- If we have isomers or resonance -- formal charges will help us determine most stable structure.

- The closer the formal charges are to zero the more likely we have the most favorable Lewis structure for the molecule.

- We write the formal charges in (). E.g. (-1)

Helpful Videos:

• Formal Charges: https://youtu.be/vOFAPlq4y_k

• Finding Valence Electrons (element): https://youtu.be/x1gdfkvkPTk

• Exceptions to the Octet Rule: https://youtu.be/Dkj-SMBLQzM

• How to Draw Lewis Structures: https://youtu.be/1ZlnzyHahvo

• Practice Lewis Playlist: https://www.youtube.com/playlist?list=PLZR1BGWBaZ1wEg1Z22ksfNo34UUbaFORo

Drawing/writing done in InkScape. Screen capture done with Camtasia Studio 4.0. Done on a Dell Dimension laptop computer with a Wacom digital tablet (Bamboo).

cueing 01

Forgive the language but your channel is the biggest blessing. A big FUCK YOU to my chemistry professor for teaching in a dry fashion. Blessed be your soul Dr.

Erin Quintero

Thank you for teaching! This was very helpful

Utkarsh Kumar

*Nitrogen oxide


To the point. Loved it

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59. Homework Assignment #9 - N2O Resonance Structures

35 views | 26 Jul. 2020

Draw three major resonance

Draw three major resonance contributors for the molecule N2O, (linkage pattern:

[N-N-O], being sure to rank the resonance structures in decreasing contribution to the resonance hybrid. Be sure to justify your answer fully!

00:00 N2O Resonance

00:45 Total # of Valence Electrons

01:25 Lewis Structure #1

03:52 Formal Charge

06:05 Resonance Structure #2

06:58 Formal Charge for Structure #2

08:40 Resonance Structure #3

09:58 Formal Charge for Structure #3

12:05 Resonance Ranking Explanation

19:52 Final Ranking

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Formal Charges: Calculating Formal Charge

619 370 views | 17 May. 2013

A step-by-step description

A step-by-step description on how to calculate formal charges. Formal charges are important because they allow us to predict which Lewis structure is the most likely to exist in the real world.

Get more chemistry help at www.Breslyn.org.

Often you are given a compound with more than one possible Lewis structure. Often this is the case with elements like Sulfur or Phosphorus which can have more than eight valence electrons. In these cases it is important to calculate formal charges to determine which structure is the best. The structure with formal charges closest to zero will be the best.

Mahendra Kumar

Nice trick.
But it is so lenthy can you have another trick to calculate Formal Charge...

Hani baloch

thankyouuu so much

Parul Aggarwal

I guess d formal charge for each atom in covalent compounds is 0.....BTW THANX???????????

Holly Fletcher

For the last example, isn't it positive 1 plus negative 1 plus zero, making the charge 0 on the SO2 with only one double-bonded O? Which would you then choose as most likely to occur because they are equally as electronegative?


Good job

Snow Forest

Very helpful thanks

Mustafa Almayah

Thx you so much

crispy aka

thank you for being so clear and concise

Magnus Manrik

What software for writing does he use? Thx for the video.

king justinv

Great explanation, thank you!

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Thanks sir ??

Alwin kennedy

it was really confusing while i learnt it from the text book but aftrer this video it was like literally so simple.
Thank you so much prof.

Naomi Osandu

Thank youu, have my final today and I’m not ready

Grant MD

woah you made this easy, thanks man! I appreciate your hard work!

Pimpo Jamir

Thank you so much

Kush Agarwal

One second. Didn't both the SO2 structures have a formal charge of 0?? So why are we only saying that the second one where both oxygens are double bonded is correct??

Sowmya Gudapati

Thank you! I just had a quick question, when both resonance structures have the same overall formal charge what do you do?

Kaushik Sanyal

Formal charge calculation

Autumn Davis

Thank you. God is good.

Sarvesh Periwal

Thank you ❤️

Rafi Shaik

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Deepesh Kumar

thanks you. understood easily by the way you explained

Tien Nguyen

Thank you for this video, it was so helpful and you explained everything so clear. Thank you.

Syd Zhen

Thank you mr Wayne for this nice video

Prerana kokane



THANK [email protected]<^>


Mil gracias!

The One

Oxygen has 6 valence electrons, howcome 6 nonbonding electrons and 2 bonding electrons???

Ehung Loh

Sir can u explain why sulphur in so2 with formal charge of 0 is able to have more than 8 valence electrons?

ali zgheib

Wohoo very useful i swear

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Thank you for making everything looks simple and easy usually teachers make it so difficult and complicated



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I am officially a fan

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Thanku .sir

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thank u king



Queen Esther

Best explanation,



Jemima yasmin Ahmed

Thank a lot

ajay Raghav

I'm from India and I like your videos so much

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Sir plz do Ferricocyanide

james Trujillo

out of the million videos, this one helped me the most thank you.

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Dr. Best!!?✌️

Abod Alashkar

How did you get 10 electrons on sulfur


Tysm!!!! ❤


Another excellent explanation. Question: other than S an P what other element can have more the an octet? David L


thank you. you helped me a lot

khaled moustafa

I sense that people who don't understand in class but fully understand on youtube are most likely not or can't focus in class. Maybe it's just me?

ok ok



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Vaibhav Pawar


ags M_x

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_ED _

Thank you!!!!

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rob ot

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New Vision

you are awesome man , thanks very much from SYRIA , you explain amazingly ! keep going

Bula Sinha

Sulphur's valency is 6. At 2:47 how can you count two electrons of the right oxygen as bonding electrons of sulphur?? Isn't this incorrect?

Anand Malu

Not sit its sir

Robert Henkel

Thank you for the help :)

Bhashit Maheshwari

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Thank you??

Akshay Kasala

OMG you made this easy, tq ?
Me too from India

Krishna Bagade

Thanks ? for the wonderful video because of this I can understand the actual method sir... ?


So sulfer has more than 8 electrons? (in the second structure)

Anand Malu

Quite cool way to teach sit....?

Bindu Barmecha

How come 2 lone pair electrons are left in sulphur when it is forming double bond with both oxygen(s)


Why is the bonding for Hydrogen 2 and not 4?


non bounding ones are counted as a whole and bounding ones are shared by two
but what’s up with the formal charge having to be close to zero?

Joel Rowel

Love u sir ?❤️❣️

Azizul Hassan

Plzzz tell how to calculate formal charge on tetrahybridoborate??

ok ok


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I had understood easily by ur's video


Thank you so much for this video!

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Now i am able to understand everything thanks ?? For the video.

Tech & FInance

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Great video :)


Thanks Dr.B

Moumita Ghosh Dastidar


Peter Mhango

thank you sir

Maryam Shakeel

He made it so simple!!!



Mesmerizing Eyes

Could you explain Lewis structure of no

Sarah DeMonia

Why do you divide the bonding electrons by 2?

Natasha Roberts

How would you find the formula charge for Cl3

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But the Sulfur will then have 10 electrons...

Sheeza Eman


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I am from india ....there are good teachers but you are best

Alejandra Reséndiz



Sir the best structure of so2 has more than 8 electrons how is it possible

Ruba Alshamy

From faculty of pharmacy in Egypt, big thanks my teacher??

Gabrielle Trinidad



Thank you...took nothing more than 30 seconds to understand .THANK YOU!!!!!!!!!

Adrian Lopez

Thank you for this video.
I will have a test tomorrow, and this was the one topic that I did not understand, but you made it easy to learn.

Abhinav Shrivastav

Thank you sir


instead of diving he bonding electrons into two (2), you can just first transform those bonding electrons into a line then count them as one, less confusion

Joseph Stewart

You are amazing.


you make it so easy to understand. thank you so much!