Molecular Term Symbol (Easiest Explanation) || Allowed and Forbidden Transitions

This is an extension of my previous video on Atomic Term Symbol.
Watch this easy explanation and share with your friends.

[@juberchoudhury9881]

Bro,most wonderful and most easiest method which you have understood us which i was never seen

[@DineshYadav-ug5yq]

Super sir.. i tried to solve these type of questions from reference books even i never got the half information... your explation is awesome... thank you so much sir...

[@subhamsahu9788]

best explanation.....ur teaching is so vivid and clear that even the tough concept seems to be easy .. hats off ...sir

[@windofhappiness]

Thank you so much ..Ur videos are really helpful.. whenever I want to understand a new concept...I search for Ur videos first..and the best part of Ur videos are that it includes previous year questions..which are must for a better concept understanding...

[@marikkanmania5661]

Ur classes are very clearly understand of topics. Thank u sir

[@keepyourheadup1078]

Thank you so much for this video!! So much better than my teacher at university :)

[@PannaPoetry]

Very simple and easy way to solve these problems. Wonderful tutorial sir.

[@kiranprabha2524]

Sir.the way u explain..is amazing..first time am thinking that I may clear csir exam with the help of your video lectures.thank you..so much sir

[@AllBoutChemistry]

kiran prabha, thank you for nice words, it means alot to me 😊

[@saumyasharma6762]

Btw sir, it is a super video. I'm revising the syllabus very easily with the help of your videos. Thankyou so much for helping. It's very easy to understand now as it was a very confusing topic. Thanx a ton sir.

[@vismiforever8357]

Good command on english

[@chemistrychannel978]

Solved that problem exited. Hydrogen is 3 €u+

[@inorganicchemistrypmrfiitk1277]

Best video on molecular term symbol starts from basic and cover all the aspects for exam.thnxs

[@AllBoutChemistry]

thank you for kind words, it means a lot to me

[@meertariq9644]

Thanks sir, sir, if the condition is like that for homonuclear diatomic g to g or u to u. what will b the transition for that?

[@reysdk5536]

Once I saw ur video..now for any topic I used to search .. understands well...

[@VTMT-t8j]

You are a very excellent professor, all the best sir

[@ipshitabanerjee1323]

Thank you very much for this explanation. It was very helpful.

[@meteb.s.8475]

Thanks a lot, this explanation is better than every other bit explained online

[@umendrakhokhar7114]

nicely explained sir, but I have an query I have read somewhere that minus sign with symbol sigma is used when multiplicity is triplet but if it is singlet ( when both electron are present in same pi orbital) in that case (+) sign will be used with Sigma symbol plz clarify the confusion .

[@jordan203]

very nice explained.. and june 2018 also had a que on transition take place or not

[@ankitasuryawanshi2386]

Really very easy explaination.i understand very well and thank you very much for this video.

[@AllBoutChemistry]

You're welcome 😊

[@blackpearlpearly2029]

Could you please explain what is the term symbol of He2 and what the charge is + or -?

[@subratrout2091]

Sir how can we get the term for singlet O2 1£g+ if rule 3 is concerned..... (+) sign......????

[@chembasicsbysujitkumar3705]

I think when there is the formation of the molecular orbitals then there is splitting in them where the molecular orbitals in sigma bonding is having lower energy than the molecular orbitals involved in pi-bond formation so there they are not degenerate and there is redistribution of electrons in the molecular orbitals

[@pravansuparia6773]

This video helps me a lot....Thanks Sir...

[@ektasingh4396]

Sir the diatomic term symbol for c2 molecule will be sigma plus or minus??

[@moniraparvin6120]

For the question first excited of h2 molecule, if the answer is option 4, then change in spin multiplicity will not be zero. Sir please explain

[@sobiakhan709]

Sm days before i watched ur video n aftr that i reglrly used to rly vry useful ....plz sir make a video on lanthanide n actnides based on the qstn of csir net n plz keep uploading more videos ...

[@AllBoutChemistry]

Thank You for being a regular viewer, I'll try to make a video on Lanthanide and Actinide in upcoming days.

[@vijayana777]

good explanation ..........thank u very much sir

[@PriyankaSingh-nm1zl]

wonderful

[@suphalsen7711]

Superb superb....

[@devendramishra603]

Sir, at time 22:40 , December 2016 problem, kindly explain how multiplicity came 1 to give answer 1pi. Thank you.

[@madhu-tn5cx]

they have mentioned in the excited state....so spin will be reversed in sigma2pz* orbital give zero spin value

[@chembasicsbysujitkumar3705]

also the two O atoms has the 2p^4 configuration so after forming the molecular orbitals they are redistributed and also there is a difference there the unpaired electron is in antibonding molecular orbital (pi-star 2px and pistar 2py) while the sigma orbitals are formed by 2pz orbitals of each of it in hybradised statewhich as a pair of 2 electrons while the pi-bond is formed by the 2py and 2px orbitals as bonding molecular orbitals having a pair of electrons while antibonding molecular orbitals in are singly occupied

[@umadevigone9991]

Oooo9

[@anniethakur5595]

Nice video . But there , I guess +/- signs depend upon whether the system is symmetric or antisymmetric w.r.t plane of symmetry passing through the nuclear axis. Actually I read somewhere. Kindly acknowledge.

[@megodzillaudeadable]

You are so much better than my professor.

[@chembasicsbysujitkumar3705]

also there is the one that sir you had shown there for the P- subshell filling in case of atomic state to be filled in first and then third orbital is not possible at all as that will violate the hund rule which says the electrons are always filled in such a way to give highest spin multiplicity in order to have highest exchange energy and also having highest value of orbital angular momentum possible that is highest value of L= 1+0 = 1 not L=1-1=0 so that is not possible for ground state term at all. at the time 15.35 of the video

[@riyamartin1159]

thank u sir for uploading this vedio this was really helpful for me that u sir thank u so much

[@AllBoutChemistry]

you're welcome :)

[@nabaankurhazra953]

Nice sir... The video and the way of ur teaching just superb... Mind blowing...

[@AllBoutChemistry]

Thank you 😊

[@maheshbabu-cx5mm]

Hi sir I have doubt in how to write electronic terms of diatomic molecules you can see the IRA N.Levine page 407 sir.

[@JiyadsClasses]

Awesome teaching😃😃👏👌👌

[@haricharanharinidevi1std1s5]

Very nice classes sir, explain molecular term symbols of hetero nuclear di atomic molecule

[@kanikagulati6460]

Very nice lecture sir thanks 🙏🙏

[@pratikshamishra6411]

Very well explained 👍👍

[@KamleshYadav-lk6ug]

Superb explanation sir

[@pankajmandal8715]

Sir, ∆l =0 is laporte forbidden eg. d to d is forbidden but it is allowed in case spectroscopic term symbol... How it is possible????

[@chembasicsbysujitkumar3705]

so the resultant angular momentum is 0 because what ever be the angular momentum of pi-antibonding molecular orbital along x direction will be negative of angular momentum of pi-antibonding molecular orbital along y- direction . similar to case in Px and Py which have the magnetic quantum no as +1 and -1 . and the angular momentum is due to the magnetic field only

[@praveenagunna6056]

Thank you very much sir.... please do regular videos......

[@AllBoutChemistry]

due to research work I'm quite irregular bt I'm trying to be regular... :)

[@Bishnoi_chem]

sir ,,plz explain for non equivalent pi electron. Questions Dec 2013

[@rajput9s764]

Thanks sir😊

[@orbitclasses194]

Superb explanation

[@manvenderyadav8711]

Outstanding

[@pavapirarthana05]

thankyouuuuuuuuu very much!❤❤❤❤❤❤

[@halavathramesh2144]

nice...sir

[@mamtagupta6092]

Tysm sir, nice explanation

[@kashminaakhtar4405]

Very helpful sir, nice explanation

[@AllBoutChemistry]

Thank you 😊

[@narayankundu8034]

why we don't use plus or minus subscript except sigma orbitals ?

[@RajRaj-mg7ne]

Sir, spin multiplicity predominate over L

[@gopalkrishnaniyogi5941]

Outstanding sir.

[@AllBoutChemistry]

gopalkrishna niyogi, thanks brother

[@susha9885]

Sir... Why they use these type of symbols for molecular term symbols???... What is link between these symbols and molecular term symbols???

[@monikaantil5553]

Keep up the good work sir👌👌

[@AllBoutChemistry]

Thank you 😇

[@renjimapb9011]

What is the Molecular term symbol of B2 molecules??

[@chandrugondavenkateswarlu8864]

good morning sir ,this video is surperb sir

[@appalanaidukarri3357]

Simply superb sir

[@AllBoutChemistry]

thank you 😊

[@ExploreMalaya]

Really very helpfullll

[@mamathapulipatimamatha5480]

Thank you

[@nehachaudhary7639]

In first excited state of hydrogen I was getting multiplicity 2..plz explain

[@sourabhbm5311]

Yeah..

[@pradeepak57]

I too

[@han-rw1bg]

@22:30 , how did u get multiplicity equals to 1? I get 3 (2×1+1=3) for 2 unpaired electron🤔

[@AllBoutChemistry]

when possible term symbol is asked the you have to consider all possible values of spin multiplicity with given number of electrons, with 2 electrons you can get either 1 or 3 but in option 1 was available so

[@han-rw1bg]

All 'Bout Chemistry, thanks sir. I understood

[@Chem_tons]

sir plz solve ques ....1st excited state of hydrogen molecule..

[@INFOGUIDEBENGALI]

16:29 sir why didn't we follow hunds rule L shouldn't be 1+0=1?

[@amitchauhan8352]

Thank guru ji

[@lakshmipediredla8153]

Your all lectures are very clear, thank you for sharing your knowledge

[@AllBoutChemistry]

you're welcome :) keep watching our videos and share with your frnds...

[@shafnat3262]

@@AllBoutChemistry sir please reply...22:40 answer cannot be π^1 ...plzz give d correct answer

[@AllBoutChemistry]

@@shafnat3262 check the answer key

[@jinpinh]

Thank you for making video

[@AllBoutChemistry]

You're welcome 😇

[@laxmibaibhavikatti1395]

super teaching sir thank you so much

[@AllBoutChemistry]

You're welcome 😇

[@parusharamudu7911]

So good sir

[@mysterychem4295]

Ty very much

[@reshmajose3150]

Question in 22:36. If we calculate spin , we get 3. But in the option 3 is for sigma. Sir calculated only l value 🤔

[@aditiboruah7793]

Sir please make videos on important topics of main group chemistry.please

[@rudranilghosh2713]

Sir I have a confusion on the question of 26:58, for sigma1s1*, how the spin multiplicity is 3 in the answer?

[@rudranilghosh2713]

Oh found my mistake, 1s1 + 1s1* so two unpaired electron

[@supriyabodake4366]

But sir according to rule multiplicity should be 3.....

[@alchemist4378]

Right bt given is 1

[@jayantadey773]

Thnku sir

[@sakshimehta7787]

Sir O2 me 2 electrons aayenge ithink

[@nikhatsheikh1334]

Sir please make a video on huckel molecular orbital theory for net

[@AllBoutChemistry]

Alright 👍

[@mahimahiwal1263]

Sir please make video on inorganic NMR

[@studymaster3804]

sir plz make a video on the topic of lanthanide and actinide..

[@AllBoutChemistry]

Alright 👍

[@aparnaprajapati5584]

Thank you sir its helping

[@AllBoutChemistry]

You're welcome 😇

[@SumanSharma-cn6om]

Thanks sir

[@divyavankudothu554]

Sir how you are saying that lambda =0

[@arifabhama9139]

Grt sir

[@splendid365adda9]

The term of 1st excited state of hydrogen molecule is 1singa u which is not including in 4 options

[@schemistry.7406]

very nice

[@pg-trb-chemneetcsirchem5282]

In 2016 question ans is 4. thank you sir

[@nishasuraniwal643]

Best explanation

[@AllBoutChemistry]

thank you

[@jyotibhatt8117]

Sir at 19:26 sec 2s+1=3 but in case of pi 2s+1=1 then how 1st option is correct

[@kashminaakhtar4405]

Yes how?

[@ukkumar3208]

Because 3pi not in option

[@shaswatvikramgupta]

kashmina akhtar ..Since there are two possibilities 1. Either both the electrons are of same spin then 2s+1=3 which is not in option or 2. Both the electron of opposite spin then 2s+1=1 which is given in the option

[@showkataziz6508]

It is asked possible term

[@chemistry-basicstoadvanced714]

For hydrogen problem option 1st and 4th both are possible.. 1st is ....when spin doesn't change we get 2s+1=2×0+1=1 4th is .... when spin also changes .. We get 2s+1= 2×1+1=3 Tell me which is more probable.. I think no spin change is more probable...

[@sandyv1485]

Thank you so much sir

[@AllBoutChemistry]

you're welcome... :)

[@dhruba6044]

Thanks

[@NikhilKumar-hk9nk]

A great video. I think you should have included one heteroatomic molecule as one of the example.

[@trendingmeekhizar]

Plz make video on walsh diagram....

[@krishanubera1538]

In case of allowed and forbidden transition, you said that the "3rd rule" is having same subscript of +/-. I answered the question of CSIR JUN 2018 by following this rule but it is not matched with csir answer key.......

[@AllBoutChemistry]

KRISHANU BERA, I think you're making some minor mistake in solving that question. Actually in June 2018 Question you don't have to worry about the sign. It could be done by two rules itself. kzbin.info/www/bejne/eZCkkHinmbSfhrM I've solved that problem here In this link and it will be around 14:30, so just check how it will be solved.

[@rabindragope6087]

NICE

[@bhagavanchowdary2303]

Sir any scope to asked this type of questions in the iit jam 2019

[@AllBoutChemistry]

in JAM these type of Questions are rarely asked

[@bhagavanchowdary2303]

All 'Bout Chemistry thanku for information sir

[@charysnm8964]

Sir pls make more vedios on csir syllabus .... it will help to poor people like me and others .....bcz we dont have money to join other private institutions or online ......its request sir please

[@hemistrychemistry2175]

Sir delta vale example K que karaiye na