Term Symbols 2

This video shows how to determine ground state atomic term symbols. If you need a refresher on how to get the electron configuration, check out the video in the General Chemistry section!

[@CHARLmca]

Watched countless videos that made this so much more complicated than it needed to be! So simple here. Thanks so much! :-)

[@JohnHarkless]

CHARLmca Glad this was clear and easy. Feel free to share with anyone else who needs it!

[@monkeymeme911]

Wow, I have been trying to figure this out for hours and this video cleared it up in minutes. You are so helpful!

[@JohnHarkless]

I'm glad this was useful. Thanks!

[@lynnterry6511]

This is incredible! Never thought I'd be able to understand this so quickly. Thank you so much!

[@laureanneMD]

Such a intuitive way to present it love it! thanks

[@khansaiqbal7945]

Wow. Everything is so well explained without unnecessary over-complication and a fantastic pace! Thank you

[@JohnHarkless]

Thanks. I'm glad this was helpful! Feel free to share it with others you think it would help.

[@kingkoller1503]

Thank you so much for the video! So much easier to follow than with our prof 😂

[@indestructiblemadness8531]

You sir, are a hero.

[@TooMuchTigerero]

great video! You and TMP Chemistry should combine chemistry explaining forces!

[@sumeyaibrahim7260]

Thank you. You are my hero from now on

[@alikidimopoulou9910]

this was super helpful! thank you so much!

[@bssmanyembefficiel6319]

Thanks so much. The understanding was lit

[@legenarymaster3696]

Thank you so much, sir.

[@tobimzw2590]

Simple and concise. Thank you very much!

[@JohnHarkless]

Glad this was useful!

[@yabooaion]

thanks so much you made my day !!!

[@tosbag18]

God bless you sir, you helped me a lot for my exam thank you

[@bellaberyle4553]

thank you so much.. Its helpful

[@toddstechtips7942]

This was extremely helpful! Thank you so much!

[@JohnHarkless]

Glad it was useful. Feel free to share!

[@aljuprannosh]

plz do you explained heteronuclear diatomic as CO

[@ahaf4654]

4.17 If you wanted to work out the symbol for 4s1 3d6, in which orbital would you put the 6th electron? Thanks.

[@nickilshah9416]

Just spent 2 hours trying to figure out how to work out the orbital angular momentum so that I could work out the term symbol for an atom- 100% recommend this video, thank you!

[@JohnHarkless]

Glad I could help! Feel free to tell people, and let me know if there are other topics I can make videos on. Also, I'm curious how you found me?

[@nickilshah9416]

+John Harkless To be honest with you, your video was on one of the options when I typed in 'term symbols' on KZbin in a desperate attempt to find out how to calculate them. -I shall let you know about any pending topics, thank you again!

[@nonimaina]

THANK YOU!!!!!!!!!!!!

[@malaayo5259]

Das war toll, vielen Dank🌸🌸🌸🌸

[@JohnHarkless]

Bitte

[@Sahyeh]

This is very helpful, thanks!

[@JohnHarkless]

Glad it helped. I'm working on one with the more detailed way to do this. Stay tuned and let me know if there are other topics you'd find of interest!

[@khanmajid6182]

thank you so much

[@wendychao6695]

This was really helpful. Thanks!

[@JohnHarkless]

Wendy Chao You're welcome!

[@spencergellner5471]

simple yet effective perfect teaching

[@JohnHarkless]

Thanks! Glad this helped you. Feel free to share it with anyone else who may need some help.

[@TheNavalAviator]

Well thanks, that was a straight forward explanation :)

[@JohnHarkless]

@@TheNavalAviator thanks, I'm glad this helped.

[@AYEPink]

super clear, thank you!!!

[@JohnHarkless]

You're welcome!

[@hamedhosseini4938]

Hi there, very thanks for your video mate. But I have a quick question, for example how for d2 orbital which has a term (3F), It has ground state of 3T1g? I don't understand how 3T1g come from. Would appreciate if you could answer my question.

[@JohnHarkless]

I'm not sure I follow. Do you have a specific case where the 3T1g term happened?

[@Ga3meRAdr3]

thanks mate

[@mriazk4635]

Thank you soo much for this video! You explained it way better then my professor did :D lol

[@JohnHarkless]

Glad to hear this was useful! I'm glad to add helpful P-Chem content!

[@maheshtumkurmaheshkp3903]

nicee video sir ....this is mahesh chem lecturer from india

[@JohnHarkless]

mahesh tumkur Mahesh k p thanks!

[@jaganmohanreddy6]

nice and super explanation tqu

[@JohnHarkless]

Thanks!

[@bikimunda8258]

really really helpful video...for your videos i could score good marks...thank u

[@JohnHarkless]

Glad i could help!

[@bikimunda8258]

John Harkless if it's not a trouble then please upload a video regarding Born-lande equation and its application... Thanks once again 😊

[@IslamDueren]

good

[@12345whoscounting]

Thanks man .... !!

[@JohnHarkless]

You're welcome. Be sure to feel free to share with anyone else you know who might need help!

[@klevabot3122]

I also found this to be super helpful man thank you il mention you in my graduation speech lol

[@JohnHarkless]

Thanks!

[@stevenhuang6331]

For the sample of C(carbon) why the electrons just only fill in +1& 0 orbital of 2p ? How about the situation that two electrons filled in +1&-1 ?Is there another kind of term symbol?

[@JohnHarkless]

This one is about doing term symbols for ground states, and usually works. BUT! It is a shortcut method. For what you're describing, you'll need to look at the microstates method. It's pretty lengthy and detail-oriented, but it's guaranteed to give you all the possible configurations. Check out the video here: kzbin.info/www/bejne/rXmviq2KpZqIqKc

[@stevenhuang6331]

OK, thank u a lot :)

[@gauravbhakar7207]

really helpful tnx

[@JohnHarkless]

say? hello! Glad I could help!

[@md.nournoby4523]

your rule can not adjust with oxygen term number. because here my L is come -1. but -1 is not represented any letter. please help sir.

[@JohnHarkless]

Ah. It took me a second to see what you're getting at. If you take the absolute value, you'll get L = 1, which would be a P. The short explanation is that you can use "holes" - the spaces that don't have electrons - when the shell is more than half full, and reverse the signs.

[@md.nournoby4523]

thank you sir for answering my question. but i have faced some problems. smoetimes i see j=L+S sometimes J=L+S, L+S-1,........modulus L-S, sometimes J=L-S, but why....

[@geppetto2055]

Writing only one microstate you could not write L=1+0 but M_L=1+0=1 , then of course it is one of the three component of a term which has L=1 (a P term). Do you agree with me or am I wrong? (That's what I remember from my second Physical Chemistry class :) !)

[@JohnHarkless]

I follow what you're saying. The short answer is that there's a long version where you do all the microstates explicitly and then apply all the rules to get an ordering of states and the multiplicity. In that case, because there's an awful lot of detailed bookkeeping, you really should do M_L, and M_S in order to get all the possible combos of L and S, and ultimately J. The process I'm using here is covered in my "Term Symbols 1" video: kzbin.info/www/bejne/robXl2trecatg5o (Your question inspires me to reconsider my decision to only show this shorter process.... I don't know if people teach this that much or how!)

[@geppetto2055]

Exactly, in principle you should write up all possible microstates which especially for tr. met. are really a lot! Then applying Hund's rule you can find the lowest in energy term (but you cannot order them unless you do a calculation!). I follow your short way of proceeding in order to obtain the lowest in energy term but I have to say that, in my opinioin it is incorrect since you sum the z projection of L (so M_L) and not L, so M_L=1+0 in the specific case. I hope I would not seem arrogant, I just want to discuss about this wonderful topics..I really love physical chemistry :) I think also that, a video about how obtaining eigenfunctions of \hat{S} and \hat{L} using ladder operators would be really appreciated from those who study atomic physics/ quantum chem. , I really liked that part when I studied it! :)

[@JohnHarkless]

Actually, you've convinced me to make a companion video to this one explaining the long way and how to: 1. get all the microstates 2. determine degeneracies 3. identify the ground state. Truth is, I don't usually get to talk that much about doing term symbols in my regular class. There's so much QM to talk about, and it explains so much in chemistry, that something has to get the short answer treatment!

[@JohnHarkless]

It's been a long time coming, but I finally did a video on the full microstates method. kzbin.info/www/bejne/rXmviq2KpZqIqKc

[@aakashyadav5662]

Dear sir, i want short tricks to solve terms symbol problems

[@JohnHarkless]

This is probably the shortest way to solve for a ground state term symbol. I.e, find L and S, use the rules to find J. The full version, including microstates, can usually be a lot longer and definitely more intensive in terms of the need to be meticulous!

[@aakashyadav5662]

so sir how I can find term symbol for 3d7 configuration

[@aakashyadav5662]

thank u sir

[@aakashyadav5662]

And sir please send the link of video to identify the given spinel is normal or inverse

[@tinho9335]

More microstates which isn't showed

[@JohnHarkless]

There's a longer video that shows the full microstates method. This one is pretty much about the shortcut for doing a ground state. You can find the full microstates one here: kzbin.info/www/bejne/rXmviq2KpZqIqKc

[@fakhrulnawawi9681]

I don't understand about how to find J? 😔

[@JohnHarkless]

Hopefully the first video can help! It explains where all three (L, S, J) come from: kzbin.info/www/bejne/robXl2trecatg5o

[@fakhrulnawawi9681]

got it..thanks

[@ms7a4]

thank you so much

[@JohnHarkless]

Glad I could help!