Finding the number of bonding pairs and Lone pairs [Around the Central Atom] - AS Chemistry

[@lalramchuani8943]

Thanks a lot! That was really helpful. Now, I understand what I haven't for a whole year. I'm glad I found this!

[@alfinkunjumon6446]

I found this video so useful. Thank you so much, you hae made A-level chemistry much easier

[@UTFT27]

you should prepare a bit more before your record, there were a lot of pauses and wasted time.

[@libbyb4067]

Just speed it up to 1.25

[@friedeggs6261]

@@libbyb4067 galaxy brain move

[@b.eze1014]

@@friedeggs6261 😂😂😂😂

[@madAlienant]

This is really helpful. GOOD JOB!

[@Bennysam007]

wow explained like a professional

[@starstarcoffee]

May I know why do you divide it by 2, I am confused where BrF3, so they will make 7 pairs of bonding? and since they will make 3 bonding pairs, there will be 4 lone pairs left? I am confused... thanks a lot!

[@anas1x741]

Amazing video , explained soo well

[@robo1471]

I love his accent

[@anushkachoudhry]

I am not able to understand what he is speaking and why did he took 4 for Cl i didn't get it

[@brennanIX]

Akansha Choudhry yeah that's wrong, Cl has 7 e. 7 x 4 = 28

[@jenniferchapman3528]

I said the same thing to myself. Cl is 7.

[@phillipschristian2]

no he said to assume each covalently bonded atom donates one electron so you add the number of atoms of chlorine there are which in that case is Cl4 so +4

[@drawNexplore]

Thank you! This helped a lot

[@syedaslamsharieff4391]

super,very helpful.thank u

[@abimass7722]

apadiya

[@syedaslamsharieff4391]

abi mass really da abi bhai

[@devanshsharma743]

preety cool
it helped me out
thanks much man ! ! !

[@jkhk7391]

Thank u very much very much

[@mollymulqueen2923]

This helped me so much, thankyou!

[@kidistNugusse]

Thank you so much

[@trinitymalave3621]

helped so much!

[@siddharth4590]

Thanks a lot ... Totally superb 👌

[@AndreaGonzalez-qr5py]

So for CCl4 would that mean that the # of single bonds is 4, # of double bonds is 0, and # of triple bonds is 0??

[@jafarjahanabdul9841]

Thanks sir you clear my doubt.

[@ShivaShankarMS_2000]

how would i calculate the no of lone pairs and unpaired electrons in (NO2)-

[@rushedhu]

Thanks ! Very helpful.

[@alevelscientist]

+Pierre-Joe Fekete Glad I could Help man :D

[@heetgandhi1]

Thank You so much sir!!!

[@kelase7435]

thanks man,really helpful

[@xnessayx]

that was so helpful thankyou!!!!

[@germanwhipreviews858]

so helpful !!! thanks

[@alevelscientist]

+German whip reviews no prob, lol @ your username

[@jessica4423]

If you are finding BP's and LP's of an ion, how do you know to add one or subtract one electron?

[@alevelscientist]

What do you mean by for an ion?

[@LokeshRajwar777]

Ty you removed my confusion

[@axceler8t]

great vid

[@yaaliniii]

this was so helpful 😊😊

[@ericnrmrf1]

What about for molecules like SI6 SF5-

[@alevelscientist]

same way. If you do use the method I described in the video you will find sulfur has 6 bonded pairs and 0 lone pairs, and you will find that SF5 has 5 bonded pairs and 1 lone pair.

[@raheelabbas2010]

thank sir

[@user-cy1jk5ly3x]

I tried this method for C2H2 but I ended up with 2 bonding pairs and 1 Lone pair, does that exist???

[@user-cy1jk5ly3x]

and what if you end up with an odd number of electron pairs???

[@yugioh2463]

why divided by 2? is it always divided by 2?

[@pranavmarla]

+yugioh2463 because there are 2 electrons in an orbital.

[@jollynass6143]

yugioh2463, An electron pair is 2 electrons each.
So yeah you devide by 2 each time using this technique to find out how many electron pairs you have.

[@cageybee777]

I tried using the same method to calculate bonding and lone pairs for H2O and got the wrong answer. Why?

[@alevelscientist]

Did you use the method for the oxygen atom?

[@nicolesilva3926]

Forgive me if this is a ridiculous question....but Chemistry is not my strong suit. So, the second example, why are the other 6 pairs of electrons on each Cl not considered lone pairs? Since Cl has 7 valence electrons and is only making one bond with C, why aren't the others considered? Is it because each atom has a complete set of 8? Are lone pairs only when the outer shell is not complete? Is this what determines whether a molecule is polar or non-polar? Thank you, anyone, who can clarify this for me.....

[@alevelscientist]

Hi, it's not a ridiculous question. I think what your asking is why didn't I count all the lone pairs in the whole molecule? The reason is that the process of calculating the lone pairs and bonding pairs is the step before determining bond angles. This being the case, the number of bonding pairs/lone pairs on the Chlorines are irrelevant, since the step after would be determining the bond angles around the Carbon atom only. I think perhaps the title of the video gave room for this misconception, I'll rename it to specify central atom.

[@alevelscientist]

About the polar/non polar thing, polarity is a property mainly determined by a combination of the differences in Electronegativity of atoms in molecules and the structure of the molecules.

[@heetgandhi1]

How to find LP and BP in NH2 molecule....total number of electrons comes to 7..so what has to be done after this!!??....also finding difficult to find lone pair in HO molecule

[@sens4lyfe671]

thank you !

[@princewilliams1410]

Do u realize where cl is on the periodic table

[@alevelscientist]

?

[@MaesterPeemore]

lol

[@oozinblob]

What about molecules like CO2?

[@alevelscientist]

I guess if it was CO2 you would need to add 2 to the number of electrons donated by that atom and take into consideration that there would be 2 bonding pairs for each double bond (the two bonding pairs per double bond would be considered as one for working out shapes of molecules though).

[@sameshanmoodley9100]

thank you. this really helped me.
grade 11 student of physics, home schooling.
-Aliya

[@JAS63preet]

thanks last second save

[@JAS63preet]

+A Level Scientist yup chemistry test...

[@pushpanjalipaudel1218]

Can you show me bf3 electron pair , bond pair,and lone pair plzzz

[@AlwaysSetApart]

Thanks

[@alevelscientist]

np :)

[@jayalakshmibaskaran3937]

Thank you👍

[@pratikswamy8006]

Thank you

[@rashmikagupta9301]

Thanks got it

[@winniethepooh8766]

legend

[@kisanadhikari2390]

tq

[@percymokoana8474]

but this technique does not work on SO4

[@mwmedia1051]

"carbon tetrachloride? this say methane"

[@aatishsingh1021]

I3- find bond order and loan pair

[@jamalshaban4703]

What about for c2h4..How many electron pairs are in that compound.And how did you get it.If you say 6 electron pairs , you are totally wrong.You must be Nigerian.Your accent tho

[@shay2844]

all alkenes have 3 negative centres which includes only 3 bond pairs

[@sys8656]

what a guy

[@ashah1575]

My guy

[@patrickwhite4422]

you mess up so much in this video. but it helped. thankss

[@alevelscientist]

+Patrick White please elaborate :)

[@CSrocketsxD]

this was so difficult to watch...

[@jcjoker100]

Don't talk to much get to the point

[@sam56094]

HORRIBLE

[@yousefa1147]

THIS IS PRETTY MUCH UNHELPFUL

[@ScribbleDribble]

Thank you!!

[@nekochan4493]

thank you. this help me a lot!!!

[@fairytales817]

thank you