Atomic mass & amu (Atomic Mass Unit) Concept with Q&A | Mole Concept | 11th Chemistry || JEE NEET

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  • เผยแพร่เมื่อ 23 ธ.ค. 2024

ความคิดเห็น • 1.4K

  • @vedantuneet
    @vedantuneet  ปีที่แล้ว +3

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  • @shivakeertana7560
    @shivakeertana7560 4 ปีที่แล้ว +409

    I wish my college had teachers like you : ) Love the way you teach.

  • @saloni8615
    @saloni8615 4 ปีที่แล้ว +222

    Best chemistry teacher ever, lots of respect to sir.

    • @technicalashu2215
      @technicalashu2215 4 ปีที่แล้ว +10

      Ye sir bhi best hai lekin mere skool k sir vo bhi ek dm super duper best vale

    • @plus___ultra
      @plus___ultra 3 ปีที่แล้ว +7

      In sir ka youtube show hai jisme is channel se jayda subscriber hai

    • @ramratansankhla
      @ramratansankhla 3 ปีที่แล้ว +2

      sir is saying that isotopes have same atomic mass and different atomic number but it is wrong.... then how he can a best teacher.....

    • @Ivy-imran
      @Ivy-imran 3 ปีที่แล้ว +1

      @@ramratansankhla then u have to teach what is correct 🤣🤣

    • @Ivy-imran
      @Ivy-imran 3 ปีที่แล้ว +3

      @@plus___ultra konsa
      A2 motivation
      Sir ka channel with 10 million subscribers

  • @RiyaRaj-cz4fy
    @RiyaRaj-cz4fy 8 หลายเดือนก่อน +6

    6:00 you are wrong, isotopes are yhe ones that have the same atomic number but different mass number
    Trick to remember - isoTOPe so the top is changed which is mass number .

  • @omprakashbarnwal3538
    @omprakashbarnwal3538 3 ปีที่แล้ว +66

    6:06 isotopes have same atomic number but different atomic mass no.

    • @jee12345
      @jee12345 3 ปีที่แล้ว +2

      ys

    • @Rahat-Ali-Hashmi
      @Rahat-Ali-Hashmi 3 ปีที่แล้ว +5

      Ghalti sy kah diya unho ny

    • @mrsahabji_1M
      @mrsahabji_1M 3 ปีที่แล้ว +4

      @@Rahat-Ali-Hashmi bhai ek galti ki baje se ham logo ka kya hoga😭

    • @mrsahabji_1M
      @mrsahabji_1M 3 ปีที่แล้ว +3

      @Awesome Gaming bhai verna ma ye video ku dekra

    • @musicmastiwithruchigupta3251
      @musicmastiwithruchigupta3251 3 ปีที่แล้ว

      Yes galti ho gayi sir se

  • @noumanriaz4363
    @noumanriaz4363 4 ปีที่แล้ว +84

    I am from pakistan... I truly acknowledge your way of teaching... love from pakistan,sir

    • @utkarshpatel8305
      @utkarshpatel8305 4 ปีที่แล้ว +3

      Good

    • @hshsheususuusus2108
      @hshsheususuusus2108 ปีที่แล้ว +10

      Mulllllllaaaaaaa

    • @hshsheususuusus2108
      @hshsheususuusus2108 ปีที่แล้ว +8

      Youare
      😅😅😅😅😅😅😅😅
      mullllla

    • @AnshGoyal.1
      @AnshGoyal.1 ปีที่แล้ว

      Kya Karoge padh kar, ban na to aatankwadi hi hai 😂🎉

    • @ruma554
      @ruma554 ปีที่แล้ว +1

      ​@@hshsheususuusus2108 hehe do you worship dinosaur bcz you also worship cow 😂😂loll

  • @dineshdilare6830
    @dineshdilare6830 ปีที่แล้ว +2

    Isotopes -mass is different
    -atomic number is same

  • @SantoshkumarSingh-hl7wl
    @SantoshkumarSingh-hl7wl 2 ปีที่แล้ว +7

    6:04 there is one correction -atomic number is same and atomic mass is different

  • @arhamlunkad9336
    @arhamlunkad9336 2 ปีที่แล้ว +1

    niether my coaching teacher explained this nor my school teacher explained this well.

  • @K.B399
    @K.B399 2 ปีที่แล้ว +4

    6:05 isotopes have atomic number same but atomic mass different.

  • @rajatmishra3962
    @rajatmishra3962 3 ปีที่แล้ว +57

    Teachers are also watch this video to know how to make monitors 😂😂😅

  • @smritipanchal7000
    @smritipanchal7000 ปีที่แล้ว +3

    i am a student of class 9th and i had a dobut that why we use carbon to calculate the atomic mass but now it is clear😊😊

  • @-MASTER21
    @-MASTER21 5 หลายเดือนก่อน +1

    really a very helful video sir
    ❤ From Nepal

  • @aadeshlandge2493
    @aadeshlandge2493 4 ปีที่แล้ว +6

    Itni video dekhi lekin aap jaise koi ni sikha paya🙏thanks sir from the bottom of my heart 😇rula ke rakh diya tha is concept ne

  • @adventuresoflife486
    @adventuresoflife486 3 ปีที่แล้ว +1

    Thanks sir... Itna acche se koi teacher nahi parhate hain...

  • @tanishkasingh.0_0
    @tanishkasingh.0_0 ปีที่แล้ว +3

    Isotopes are having same atomic no.but different atomic mass aap ne galt bola 6:04

    • @raviteli5280
      @raviteli5280 ปีที่แล้ว +1

      Yes you are right I am also think about isotopes😅

    • @Shivanshubaluni.
      @Shivanshubaluni. ปีที่แล้ว +1

      👍 yupp..!!

  • @ghulammujtabamujtaba1572
    @ghulammujtabamujtaba1572 ปีที่แล้ว +1

    You are best teacher
    Please check the video and listen clearfully what you have told about isotopes.?

  • @saptarshidey1960
    @saptarshidey1960 3 ปีที่แล้ว +5

    Actually sir wo platinum-iridium cylinder tha Jo sevres ke ek measurement institute me rakha tha hai na?

  • @kanishkasambre1884
    @kanishkasambre1884 2 ปีที่แล้ว +9

    Sir u actually made it Easy(Ejee).....😊Thanks👍😊

  • @manojlambat6578
    @manojlambat6578 ปีที่แล้ว +1

    Sir agar mass of C12 Atoms = 12 amu!
    Then mass of C12 baki Atoms se bhari hota hai kya ?

  • @shivamchaudhary597
    @shivamchaudhary597 4 ปีที่แล้ว +4

    Sir jo smjhaya hai na ....dil jeet lia ❤️...hmare dil mai aapke liye izzat or bhi jyda badh gyi 😂❤️👍🙏

  • @amangound.4971
    @amangound.4971 3 ปีที่แล้ว +1

    sir jab maas gram me diya hoga to AMU me kyo converd karna hoga?..🙏🤔

  • @lalitsahu7227
    @lalitsahu7227 5 ปีที่แล้ว +173

    Aaj tak aapse aaccha padhane wala nai dekha maine.
    Thanks a lot sir for give your imp time for us

    • @tanushreeagarwal2102
      @tanushreeagarwal2102 5 ปีที่แล้ว +4

      Edumantra hai ..

    • @aryangamesandallchannelsav9999
      @aryangamesandallchannelsav9999 5 ปีที่แล้ว

      @@tanushreeagarwal2102 yeah

    • @tekchandverma7486
      @tekchandverma7486 4 ปีที่แล้ว

      Hamari to kismat mein hi ni he...
      Hmko to aise teachers Milein hein jo cooperate karne ko teyyar hi ni he ....

    • @DevKumar-ov9xr
      @DevKumar-ov9xr 4 ปีที่แล้ว

      @@tekchandverma7486 ek baar mere sir s bhi try kr k dekho he is also so innocent and amazing dfcaurangabaduniquechemistry hai unka link

    • @sagartadac5599
      @sagartadac5599 4 ปีที่แล้ว +1

      Sourya Grover acchi h

  • @Cartoonworld-lz9ym
    @Cartoonworld-lz9ym 4 ปีที่แล้ว +1

    Sir you are very best in the world

  • @tanujkumar1836
    @tanujkumar1836 4 ปีที่แล้ว +34

    Sir , u did a mistake
    Isotopes hv same atomic no.but diff.mass no.🙏🙏🙏

    • @acmelodies5365
      @acmelodies5365 4 ปีที่แล้ว +2

      Isotope ko bol ke inhone mujhe confuse kr diya

    • @hypergamingff9763
      @hypergamingff9763 4 ปีที่แล้ว +3

      Jab apne bataya to mai 2-3 bar remind video kar kar deka ki akhir mai galat ho ya phir sir se mistake ho gaya

    • @sonipriya8059
      @sonipriya8059 4 ปีที่แล้ว

      Haa

    • @mohammedimran12344
      @mohammedimran12344 4 ปีที่แล้ว

      same confusion i had.

    • @parmatmasingh8393
      @parmatmasingh8393 4 ปีที่แล้ว

      Hn, sir aapne hmko v confuse kr diya

  • @suniljaat2589
    @suniljaat2589 4 ปีที่แล้ว +1

    Very nice sir ji aap bahut achha padate ho👍👍👍👍👍👍👍👍👌👌👌👌👌👌👌👌👌👌👌👌👌👌👌👌👌👌👌👌👌👌

  • @orexshorts9550
    @orexshorts9550 4 ปีที่แล้ว +137

    🤔🤔🤔Agar youtube ye setting la deta ki chahe kitna bhi like kar sakte🤗🤗🤗 ho mai million time👍👍 like button ko press karta

  • @suhanachemistry5150
    @suhanachemistry5150 4 ปีที่แล้ว +2

    No words just amazing the way your comparison

  • @shubhyadav6112
    @shubhyadav6112 2 ปีที่แล้ว +3

    Very very well explained sir🙏🙏🙏salute to your teaching

  • @bharathm8856
    @bharathm8856 3 ปีที่แล้ว +1

    Way of understanding is much good

  • @RiyaSharma-fq9pz
    @RiyaSharma-fq9pz 4 ปีที่แล้ว +3

    You are best teacher of the chemistry

  • @samshaikh4799
    @samshaikh4799 4 ปีที่แล้ว +2

    6:00 recheck ...it

    • @samshaikh4799
      @samshaikh4799 4 ปีที่แล้ว

      Are sir bole ki mass number same aur atomic number different so it's not right

    • @samshaikh4799
      @samshaikh4799 4 ปีที่แล้ว

      @@nothingyt1548 ok

  • @manojlambat6578
    @manojlambat6578 ปีที่แล้ว +4

    Thank-you sit 😢
    I was really struggling for it 😊

  • @kalpanabera3496
    @kalpanabera3496 4 ปีที่แล้ว

    Samajh ne ka tarika bahut mast.👌👌👌👌👌

  • @sekharsekhar2993
    @sekharsekhar2993 4 ปีที่แล้ว +3

    Is the isotopes should have to the captain (C-12 atom) or not
    Nice explanation sir
    Property - Isotopes

  • @PragyaSingh-zk7vc
    @PragyaSingh-zk7vc 2 ปีที่แล้ว +13

    Arvind sir u are great 😍.... I watched soooo many vdos but could not understood the concept but because of you I completely understood it in 25 mins.... Thank you🙏💕 sir ❤ god bless you🙏💕

    • @shatibagum9327
      @shatibagum9327 8 หลายเดือนก่อน

      You are Right❤❤❤❤❤😊😊😊

  • @rawseed2973
    @rawseed2973 2 ปีที่แล้ว +5

    Very well explained, Thanks🙏🙏

  • @babitabhakuni6607
    @babitabhakuni6607 4 ปีที่แล้ว +1

    I also think that your teaching method is gzzzbbbb🤓🤓🤩🤓😝😜😋

  • @kshitijecs
    @kshitijecs ปีที่แล้ว +3

    It was one of my most doubtful concepts😢....but you have cleared all of my doubts sir... thank you so much 🎉

  • @muzamilhassan3768
    @muzamilhassan3768 4 ปีที่แล้ว +1

    Excellent. Sir. I. Very. Thank. Full. To. You.

  • @akhilsharma5614
    @akhilsharma5614 3 ปีที่แล้ว +5

    Sir sorry to say but I think isotopes have same atomic number and different atomic mass , and sir has said isotopes have same atomic mass ,plss someone correct me if I'm wrong

  • @mazedaarmnemonics9091
    @mazedaarmnemonics9091 5 ปีที่แล้ว

    What is the difference between atomic mass and average atomic mass and mass of an atom and atomic weight and relative atomic mass??

  • @faqirhussain3231
    @faqirhussain3231 5 ปีที่แล้ว +5

    Sir relative mass is mass of an atom compared with mass of carbon 12 then how it has unit of amu .when mass unit is cancelled by mass unit???????

  • @riskyjaatshab950
    @riskyjaatshab950 3 ปีที่แล้ว +1

    Sir aapne bola ki isotope ka mass number same ho or atomic number different h jo ki galat h aur isotope ve hote h jinka mass number different ho aur atomic number same ho at 6:05

  • @shankarsinghania76
    @shankarsinghania76 3 ปีที่แล้ว +31

    Someone noticed at 6:6min
    About isotopes
    Sir has mistaken.
    Isotopes have same atomic number but different atomic mass

  • @mdnoorainalam4139
    @mdnoorainalam4139 2 ปีที่แล้ว +1

    Thanks a lot sir
    Mera ye topic clear ho gya

  • @adnanhasmi2167
    @adnanhasmi2167 2 ปีที่แล้ว +3

    Sir really your teaching style is to much well... I want offline teachers like you

  • @RaviParmar04
    @RaviParmar04 3 ปีที่แล้ว +1

    Isotopes me atomic number same hote hai atomic masses different hote hai ❗

  • @yudhishthirthakur7123
    @yudhishthirthakur7123 3 ปีที่แล้ว +13

    I am in 10th class but I was confused at amu, but what an explanation he has. Just Awesome!

  • @siddharthrai9342
    @siddharthrai9342 4 ปีที่แล้ว +2

    Amazing content 🙏🙏🙏🙏🙏🙏 dhanyawad Sir jiii

  • @AsifKhan-fn1fe
    @AsifKhan-fn1fe 2 ปีที่แล้ว +4

    You are a great teacher 👌✨

  • @trendingeditz-status8423
    @trendingeditz-status8423 2 ปีที่แล้ว

    Are relative mass kaise nikala? Sample kis state mein lete hain? Usmein number of particles kaise calaculate kiya hoga? Uske bina atomic mass nhi pata kar sakte. Na absolute na relative!

  • @sobhagininayak7647
    @sobhagininayak7647 3 ปีที่แล้ว +10

    Legends are here by seeing Arvind Arora sir as we know him he is the best fact explainer , so he can also explain a thing properly .

  • @TargetOnline-p9k
    @TargetOnline-p9k 5 หลายเดือนก่อน

    Bahut bdhiya sir❤❤ gjjb explained wahhh

  • @statusshortsss1070
    @statusshortsss1070 4 ปีที่แล้ว +3

    Sir you are the best teacher 🤗😊🤗

  • @manishkr278
    @manishkr278 ปีที่แล้ว +1

    Mujhe lagta hai kuchh log sirf video me kya galti hai wahi dhudhne aate hai yarr sir ki padhai ka level dekho and enjoy it.❤

  • @Bablukumar-vf1sl
    @Bablukumar-vf1sl 5 ปีที่แล้ว +32

    One correction isotope have same atomic no and different atomic mass

    • @adroway
      @adroway 5 ปีที่แล้ว

      Exactly

  • @rishuraj8576
    @rishuraj8576 3 ปีที่แล้ว +1

    student cant judge teacher who is good and who is bad because teachers have knowledge better than student thats why they are teacher

  • @muhammaduzair5958
    @muhammaduzair5958 5 ปีที่แล้ว +3

    Sir mashallah bht mahnat sa samjhaya ha ap na thank u sir

  • @krishnamaurya8428
    @krishnamaurya8428 4 หลายเดือนก่อน +1

    Sir u are best teacher 😊😊

  • @vedantuneet
    @vedantuneet  2 ปีที่แล้ว +20

    👉JOIN OUR TELEGRAM GROUP NOW! For Access to Session, PDF, Study Materials & Notes.
    🔥Join Our Official Telegram Now: t.me/v_nme

    • @moddeore4118
      @moddeore4118 2 ปีที่แล้ว +3

      Sir,we know that atomic number is same but atomic mass is different is called as isotopes
      And,
      Atomic number is different but atomic mass is same is called as isobars
      In above lecture
      At 6:13. Sec this may same mistake

    • @5Facts_House
      @5Facts_House 2 ปีที่แล้ว

      @@moddeore4118 yes, you're right

    • @shwetagupta9004
      @shwetagupta9004 2 ปีที่แล้ว +1

      Isotopes m atomic no same hota hai but atomic masss doff hota h

  • @surendraprasadyadav5837
    @surendraprasadyadav5837 4 ปีที่แล้ว

    Aap bahut acha tarah se padhate hai aisa video TH-cam pe bhej dijiye ga sir🙏🙏🙏

  • @RAJENDRAKUMAR-qy5oh
    @RAJENDRAKUMAR-qy5oh 4 ปีที่แล้ว +16

    Wow that's the energy of a good teacher

  • @Cartoonwaalatvhome
    @Cartoonwaalatvhome 2 ปีที่แล้ว

    6:04
    Atomic number same , mass number different
    Well explained , thanks a lot

    • @Naharsingh717
      @Naharsingh717 2 ปีที่แล้ว

      Yes bro galti se nikal gaya

  • @goutambhambhani270
    @goutambhambhani270 2 ปีที่แล้ว +4

    Love the way you teach sir love the way you teach 🔥❤️

    • @ab_ee_y
      @ab_ee_y 2 ปีที่แล้ว +1

      Haai broo.... i have a dought can you clear please ?....
      Your +1 exam starting date?

  • @Suvankar_Nayak29
    @Suvankar_Nayak29 2 ปีที่แล้ว +2

    Isotopes means same atomic no different atomic mass but sir u said the oppisite

  • @aryankanojia2711
    @aryankanojia2711 2 ปีที่แล้ว +5

    Very very thank you,
    I am student of class 9 but still i am able to understand because of your way of teaching.....
    Thank a lot✨

  • @AbhishekKumar-xk7vu
    @AbhishekKumar-xk7vu 3 ปีที่แล้ว +1

    Bhai bhaut sari video dekhi , but concept Yagi clear hua

  • @medico65
    @medico65 3 ปีที่แล้ว +25

    The best way of teaching!!! Really impressive carry on teaching forever

    • @Tawabshahshah
      @Tawabshahshah หลายเดือนก่อน

      App ko kase pata chala

  • @mujeebanwar9008
    @mujeebanwar9008 8 หลายเดือนก่อน +1

    Mr vidantu welldone i am principal at a govt high school pakistan

  • @dipanshurawat6546
    @dipanshurawat6546 5 ปีที่แล้ว +10

    Sir galat bol diya thoda repeat kar dete isotops atomic mass different and atomic number same 6:03

  • @knowit7922
    @knowit7922 3 ปีที่แล้ว

    Sir!! Pehli baar samajh aaya. Thank you.

  • @Aman-zc8pw
    @Aman-zc8pw 5 ปีที่แล้ว +4

    Firstly we findout, 1mole=molar mass or atomic mass so we have to know molar mass
    And when we find out molar mass we should know mass of 1 mole then what was found first 1 mole or molar mass please explaine

  • @komalkale8177
    @komalkale8177 2 ปีที่แล้ว

    Sir, handwriting is very best 👌👌👌👌👌

  • @sandeepkaursandeepkaur9569
    @sandeepkaursandeepkaur9569 5 ปีที่แล้ว +4

    Best video on this topic......🤗🎆

  • @ibrarahmed7100
    @ibrarahmed7100 ปีที่แล้ว

    Sir excellent method of your teaching

  • @meallmighty4ever
    @meallmighty4ever 4 ปีที่แล้ว +6

    isotope hota hai atom with same atomic no but different mass no ,lol, nevertheless, the video was good , thank you for your effort

  • @kavitarana2757
    @kavitarana2757 3 ปีที่แล้ว

    Socha nhi tha ek video mera itna bda doubt clear karegi sir thank you so much

  • @kishorediwakar1059
    @kishorediwakar1059 2 ปีที่แล้ว +4

    Sir you are role model for me. I follow u. U are awesome ❤️

  • @HabibUrRahman-sr2wn
    @HabibUrRahman-sr2wn ปีที่แล้ว

    Before this relative mass how they use to calculate the mass of atom
    Moreover how they calculateed mass of carbon in the first place...
    And why it is hard to find the mass of each atom through mass spectrometry
    Why do we need to move toward a relative system of this mass calculation

  • @nikhilmishra6569
    @nikhilmishra6569 5 ปีที่แล้ว +7

    Sir description box me kaha question hai plzzx

  • @onlyforstudy9780
    @onlyforstudy9780 2 ปีที่แล้ว +2

    Sir now I am coming in 9 class and I had start my preparation .When I read this chapter I had understand all the topic but when I read this one I did not understand anything so my mind recommended me teach it from arvind arrora sir and it is a superb explanation

  • @SS-kw1xc
    @SS-kw1xc 5 ปีที่แล้ว +34

    Sir by mistake u defined isotopes wrongly. They r actually the atoms of same element having same atomic no. But different mass no.

    • @whatsappstatusfanclub8145
      @whatsappstatusfanclub8145 5 ปีที่แล้ว

      Silly mistake.

    • @AnandSharma-qt3gi
      @AnandSharma-qt3gi 5 ปีที่แล้ว +1

      Ek tapakti boond aapki zindagi barbad kar sakti he 😁😁

    • @moyesmagic
      @moyesmagic 4 ปีที่แล้ว +1

      Doesn't matter See the way of sir's teaching😄

  • @drpommykamalia424
    @drpommykamalia424 3 ปีที่แล้ว +1

    Sir your teaching way is really good and cool

  • @Yash-rk1qv
    @Yash-rk1qv 4 ปีที่แล้ว +4

    You teach better than making tik😉 tok

  • @usmanrazzaq3352
    @usmanrazzaq3352 4 ปีที่แล้ว +1

    Value of Na avogadro's numbers is 6.023 × 10power23

  • @kshitijsharma3522
    @kshitijsharma3522 3 ปีที่แล้ว +24

    Are short vale bhia 😂😂😅 aj tk sirf apke you tube shorts dekhe h phli baar koi concert dkh ra hu 😅🙏🙏

    • @jaya7986
      @jaya7986 3 ปีที่แล้ว +1

      Yes bhai

  • @dineshparwani9008
    @dineshparwani9008 4 ปีที่แล้ว +1

    Thanku so much 😊😊

  • @farehanaaz2248
    @farehanaaz2248 4 ปีที่แล้ว +27

    During this pandemic I wasn't able to understand anything but u helped me out, thank you so much.
    My words r less than ur work. Thanks again.

  • @cabriogaming9464
    @cabriogaming9464 ปีที่แล้ว

    6:03 Sir Isotopes means the Element have Same atomic number but different atomic mass !!!

  • @ravikantyadav2563
    @ravikantyadav2563 3 ปีที่แล้ว +14

    Best Chemistry teacher really .you made this topic very easy,a lot of respect for you 🙏🙏

  • @Ashutosh.Mishra9569
    @Ashutosh.Mishra9569 4 ปีที่แล้ว +1

    Sir aap to best 👌👌👌

  • @capturednature120
    @capturednature120 4 ปีที่แล้ว +7

    Whenever I search a topic from chemistry I use to write Arvind Arora at last...
    If same thing happens with anyone hit like.. 🥰🥰🥰🥰🥰
    Salute to the art of your teaching..
    Love you sir ❤❤❤❤❤❤❤❤❤

  • @shahunknowngaming
    @shahunknowngaming 4 ปีที่แล้ว +1

    Yes Shreya Singh is right I was also confused at that point of isotopes
    Actually sir defined the isobars by mistake but he mean to say about the isotopes at that point in this video excuse me sir pls for pointing out your mistakes but it is necessary for all the viewers because they will get confused at that point

  • @sameerkumawat402
    @sameerkumawat402 3 ปีที่แล้ว +11

    Who is here after promot 10th board exam ?

  • @drunk._.gaming9911
    @drunk._.gaming9911 4 ปีที่แล้ว +1

    Sir aap bahut acha pdate hoo love u

  • @Suhanilal946
    @Suhanilal946 5 ปีที่แล้ว +4

    Isotopes are having same atomic no. but different atomic mass and not which have said sir.

  • @moinuddinmutwalli5289
    @moinuddinmutwalli5289 4 ปีที่แล้ว +1

    Thanks a lot 👍👍👍

  • @nanditadas4410
    @nanditadas4410 4 ปีที่แล้ว +18

    Sir , this is the best lecture on atomic mass i have ever found....now this topic is crystal clear for me...thank you very much sir....

    • @balaramjena6439
      @balaramjena6439 4 ปีที่แล้ว

      Sir thanks apki wazese hume padhne me bahut help hote he

  • @sarojkumarjha6990
    @sarojkumarjha6990 3 ปีที่แล้ว +2

    Best chemistry teacher in my life