1.Three triads 2.136 3.(i)The law succed only upto calcium element not further it (ii)There were no arrangement to add new discovered elements as Newland think that only 54 elements can be possible. Note: -2 Que explained , as if they are triads b=a+c/2 88 =40+c/2 88×2=40 + c 176 = 40 + c 176 - 40 =c 136=c... That 's all.

You are the best teacher on KZread i have found till now!

@ManochaAcademy

5 жыл бұрын

Thanks a lot :) Do check out my website : www.manochaacademy.com

Q1) Dᴏʙᴇʀᴇɪɴᴇʀ ɪᴅᴇɴᴛɪғɪᴇᴅ 3 ᴛʀɪᴀᴅs ✓ Lɪ , Na , K ✓Ca ,Sr , Ba ✓Cl ,Br, I Q2 ) 40+ x/ 2= 88 x = 136 Q3) • it was valid for lighter elements i.e upto calcium (Ca) • He placed two elements in a single group (slot)eg: (Co , Ni) ; also the properties of Co and Ni were not matching in which he had placed with cl , br , I etc Thnku sir for giving us hw 💯

Hi sir ,you are the best teacher , And the answers for the homework questions are : I) Dobereiner was only able to identify 3 triads . ii) we know that (element A+element C)/2 = elements B (40+C )/2=88 40+C=88*2 40+C=176 C=176-40 C=136 Therefore answer is 136 iii) 2 issues in Newlands octaves were : a)it was only applicable till element calcium . b)newland assumed that only 56 element will exist and no another element will be found in future , but later when new element were discovered Newlands law of octaves became completely irrelevant BUT HIS LAW WORKED VERY WELL IN ELEMENTS CONTAINING LIGHT ATOMIC MASS.......... SIR THANKS A LOT FOR AN EXTODINARY SESSION .....

1) 3 2)A+C/2=B 40+C/2=88 40+C=88×2 40+C=176 C=176-40 C=136 3)i. He kept two elements in same slot ii.his law was only applicable for 56th element that is calcium ii.

Sir i am from kendriya vidyalaya. My science teacher sent this link to me for a good explanation. Thanks alot for your explanation.

@ManochaAcademy

3 жыл бұрын

You are most welcome

@senthilkumar8702

3 жыл бұрын

Lie

@senthilkumar8702

3 жыл бұрын

Why don't you brush your teeth Mr you teeth is in yellow color

@Sajid-sk8ut

3 жыл бұрын

@@senthilkumar8702 ravi?

@Aish_2.0

3 жыл бұрын

@@senthilkumar8702 abe saale wo padha rhe hai to pad

1) 3 triads 2) A+C/2=B 40+C/2=88 40+C=88×2 C=176-40=136 3)He plced two elements in the same slot The Newlands law of octaves is only valid till calcium

I was trying to help my son with the chapter. Stumbled on this video accidentally. Found it very helpful. Most striking thing is that it is explained in a very simple manner. Excellent work Mr_____. Sorry, don't know your name.

@ManochaAcademy

4 жыл бұрын

Glad it helped! My name is Sandeep Manocha

@teju4316

2 жыл бұрын

@@ManochaAcademysir I know that manocha but now I got to know that before manocha Snadeep is their

@firegamingadi4010

2 жыл бұрын

@@ManochaAcademy how to find out 2 question

@hackerclone1354

2 жыл бұрын

Let him study himself idiot.. he is in 10th std

@swayamjeetpadhi9303

Жыл бұрын

@@firegamingadi4010 Its easy Just add 40 and 88 40+88/2 = 64 Hope it helped

One of the best teacher I never seen sir. Thank u sir for providing some classes freely. Q 1. 3 Q 2. 136 Q 3. It is suitable upto calcium And two elements in one box

My answer! Q1. Three traids, (average of atomic mass of 1st and 3rd element is approximately equal to the atomic mass of 2 ND element . ) Q2. We know that, average of atomic mass of 1st and 3rd element is approximately equal to the atomic mass of 2 ND element in order, let us assume C to be x, thus, (A+x)/2=88, (40+x)/2=88 or, 40+x=176,or, x=136u Atomic mass of c is 136u Q3. The two issues were - the table could be valid for the lighter elements till calcium (Ca) . There were only 56 elements discovered till that time (1866) but after the exploration of new elements caused issues and demerits of NewLands table. Edit : Thanks a lot! You are a true teacher 🙏🙏 You helped me memorising full book of science in a month.

Ans 1. Dobereiner identified 3 triads Ans 2. 136 Ans 3. (i) It was applicable only till calcium (ii)cobalt and nickel were placed with elements like hydrogen, fluorine, chlorine, bromine, etc whose chemical properties are very different from that of cobalt and nickel

Q1. 3 Q2. Approximately 136, because: (A + C)/2 = B Hence (40 + C) = 88 * 2 40 + C = 176 C = 176 - 40, Hence *C = 136* Q3. i. It only was applicable till calcium. ii. It put two elements in one box. iii. It only took into account the 56 elements that were then discovered, and when more were discovered, many elements could not be fit into the table.

Answers: 1)Dobereiner identified 3 triads 2)Let us assume C=x Given A=40,B=88 According to question, A+C/2=B =>40+x/2=88 =>40+x=2x88 =>40+x=176 =>x=176-40 =>x=136 Thus, the atomic mass of the element C is 136 For checking, A+C/2=B =>40+136/2=88 =>176/2=88 =>88=88 Thus, L.H.S=R.H.S. 3)The 2 issues are: i)Newland thought that there were only 56 elements in nature. ii)The Law of Octaves was only applicable up to Calcium(Ca). I hope, that I have given the right answers.. I am from West Bengal..

@rufusbabu5434

7 ай бұрын

👏

@mysteryhours.9414

7 ай бұрын

🎉

2 nd answer is 136 let element C be x then , (40+x)/2 = 88 40 + x = 88 multiplied by 2 = 176 .'. x = 176 - 40 = 136 I came across various answers regarding this question , that's why I decided to write this comment along with its necessary steps . if u again put value 136 as x and again do the equation to check the answer you'll get as 88 . HOPE THIS HELPS 😌

@deepthideepthi861

2 жыл бұрын

Thank you so much for the explanation. ❤️

Q1. 3 Q2. (40+x)/2 = 88 x = 136 Q2. a)The classification worked only on the first 20 elements. b)Newland adjusted two elements cobalt and nickel in the same slot and these were placed in the same column as fluorine, chlorine and bromine which have very different properties from co and ni.

@lifevashii9931

3 жыл бұрын

Calcium was the 17th element at that time

1 - 3 Triads 2 - 136 is the At. Mass of element ' C ' 3 - a) Newland's law of octave worked quite well for the lighter elements but did not work with heavier elements , i.e., those lying beyond Calcium. b) he adjusted 2 elements , Co & Ni in the same slot & these were placed in the same coloumn/group as Fluorine , Chlorine , & Bromide which have very different properties than these elements

Sir thank you so much I was crying for my tomorrow's chemistry exam....... My senior suggested this KZread channel........ Thanks a lot sir..... I'll share this channel in my class sir.... Once again thanks for infinity times......

@ManochaAcademy

3 жыл бұрын

Most welcome

Now it is exams time so I didn't understand the concept related to this..And I searched in youtube and found ur video... It's really easy for me now..Thank u

@ManochaAcademy

4 жыл бұрын

It's my pleasure

Sir ....frm u...am really become a good speaker....in English much better than before.... because u teach as excellent as u speak.....

@ManochaAcademy

4 жыл бұрын

Glad to hear that. Keep watching and do share with your friends

@khagendranathsarma1080

3 жыл бұрын

Mee too....

@thegreatgamer2236

3 жыл бұрын

Chip laudi

@jyotirmaytripathi3331

3 жыл бұрын

@@thegreatgamer2236 jio sheraaa😂😂😂

A1-3 triads A2-136 A3-in the time of newland there were only 53 elements, and when new elements are discovered the properties of those new elements didn't match.......... Sir the concept is crystal clear to me Thank you sir.

@harshinishashi4233

3 жыл бұрын

A3 - It's 56 elements not 53 elements dude

Q1. 3 traids Q2. 136 Q3. The limitations of Newlands law of octave are. i. The table was only valid till calcium ii.he assumed that there are only 56 elements in nature. iii.he put two elements in one slot.

@sourikmondal3921

2 жыл бұрын

Yes you are right bro in the second question. Most of the students are writing 5 64 but these dumbs didn't understand the question properly.

1) Dobereiner had 3 triads 2) my guess the third c is 137 because 137+40 is 177 so 177/2 is 88.5 average B is 88. 3)a)there are two elements in one slot. b) There are only 56 elements in Newlands laws and the property in which 1st elements property is same as 8th elements property didn't continue the in the other elements.

Q.1 Dobereiner identified 3 triads Q.2 A+C/2=88 40+C/2=88 C/2=88-40 C/2=48 C=48×2 C=96 Q.3 2 issues with newlands law of octaves were that: (i) He stated that only 56 elemenys existed in nature and no more were to be found. (ii) Fe was placed far away from Co and Ni whereas they have similar properties. (iii) The Law of octaves was applicable only till Ca.

I had never seen such perfect explaintion in any video of you tube awesome sir you are very talented and know how to express own knowledge....awesome sir thank you so much sir.....💝💝💝💝💝💝😘🇮🇳👍

@ManochaAcademy

5 жыл бұрын

@harshad dhanke, Thanks a lot :)

Sir you are my favorite teacher all your video are fantastic all concepts of newland law of octaves and Dobereiner's triads are clear to me THank you so much sir !

@ManochaAcademy

3 жыл бұрын

Keep watching

Sir u teach very well other teacher take 2hr to teach u explained beautifully in just 12 min Minblowing 🎉🙏 keep going sir

@ManochaAcademy

2 жыл бұрын

Thanks for liking

Sir i am child of class 10.when my teacher take this lesson I don't understand and in the mid term exam I simply sitting on exam hall. When I saw this class it is wonderful. It was a nice by manocha sir. Keep upload more lessons. Faithfully thank you

Q.1 dobereiner identified only 3 triads 0.2 atomic mass of 3rd element is 64 Q.3 1 issue: The table was only valid till calcium. 2 issue was: he assumed that there are only 56 elements there in nature Lastly i would really thank you for explaining this topics in a simple way i really loved ur explanation I have test today i was really confuses of this topics..But now i am crystal clear.. Thanks for your big support 🤩

One thing which is awesome about you is you never post very long duration videos...well I easily get bored while watching long duration videos😅so I prefer your videos for understanding several topics...thank you sir

@ManochaAcademy

4 жыл бұрын

Thank you so much 😀

2Q) A=40, B=80, and C=x A+C÷2=B 40+x÷2=88 40+x=88×2 40+x=176 ×=176 - 40 =136 simple answer

with this video all my queries are all solved .......... Thank you sir . Now I can score good marks in my test..... thank you so much ..

sir your teaching is so nice and it just makes the concept clearer and easier for me.

Q1. He identified 3 Triads Q2. C=64 Q3. a. He put two elements in one spot. b. Newland assumed that there are only 56 elements in nature. c. Only valid till calcium (CA).

@AURKODAW

Жыл бұрын

answer in 136 for the 2nd one

You teach the various concepts practically hence we can understand easily

@ManochaAcademy

5 жыл бұрын

Thanks a lot :)

@mrsham100

3 жыл бұрын

@@ManochaAcademy sir Hindi me bhi bolo

Answers: 3 triads 136 Worked only for the elements till Calcium; he assumed that there were only 56 elements in nature, so all the elements which came after that did not fit in the table Thank you so much! your videos are helping a lot during this lockdown...

Sir I am new to your channel. I was worried about this chapter but you solved my problem .your explanation literally wonderful. Thanks .

Thank you sir I like your way of teaching it was excellent

@ManochaAcademy

4 жыл бұрын

Thanks and welcome

These are the answers for your questions sir 1 -3 2-40+88/2 is equal to 64 3- it is worked for only lighter elements till ca he assumed only 56 elements in nature Thank you sir this helped me a lot thank q..

@adarshraj4696

2 жыл бұрын

B = A+C/2 so B x 2 = A+C 88x2 = 40 + C 176 - 40 = C Hence, C = 136

@gooooooooooooooooooooooo

2 жыл бұрын

@@adarshraj4696 yess but I did like 40+c/2=88 So 88-40=c/2 48*2=c C=96 Is this right 🥲

@adarshraj4696

2 жыл бұрын

@@gooooooooooooooooooooooo i have not perfect reason why this wrong but 40 is also in division so we can't directly move one value. either we move whole numerator to right side or denominator.

@bgmstation8772

2 жыл бұрын

@@gooooooooooooooooooooooo no broh!.. We can't take the 40 like that

Sir. Frist time. I have understansing in chemistry by ur video it's helping sir.. Lot and lots... Tqqqq

I love your your teaching very much sir. Its very easy to understand your classes than our teachers teach. Thank you very much sir, Q 1:- 3 triads Q 2:- 136 is the atomic number of element C Q 3:- 1 - Newland's laws of octaves rule is only correct upto Calcium and 2 - he placed two elements in one box Ex:- Cobalt and Nickel & Cerium and Lanthanum in one box.

@ashrith4148

2 жыл бұрын

Sodium(Na) was the 9th element at that time (Newland's laws of octaves)

Q1. Three Q2. (40+x)/2=88 40+x=176 ×=136 Atomic mass of 3rd element is 136. Q3. Only valid upto Ca and He assumed that elements are 56 in nature

@ManochaAcademy

5 жыл бұрын

Super! All your answers are correct :) You can also try the Quiz for this video on my Website: www.manochaacademy.com/chapters/34/lessons/36 . Quiz button is below the video.

Q1. Three triads Q2. 136 Only valid till Calcium He assumed that there were only 56 elements in nature He put two elements in one slot

Sir ur one video make me get full concept clearly without any doubts Thanks a lot For such videos Which may help the students who really were not have resources to study..... They can watch ur videos and they can get whole lesson without any doubts I thank uh for such resources

very awesome video ....thanks a lot ....could you please provide the link for the mendeleevs periodic table and modern periodic table

1. 3 triads 2. let the atomic mass of the third element be x therefore, A/Q, ___40+x___ = 88 2 => 40 +x = 88 *2 => x= 176 - 40 = 136 therefore the atomic mass of the third element is 136 3.two issues with Newland's law of octaves are: a) he grouped elements having different chemical properties together and elements having similar chemical properties far away. b) he thought that only 56 elements existed in nature and no other elements would be found later in the future.

@ManochaAcademy

5 жыл бұрын

Super!! All your answers are correct :) Also try the Quiz for this video: www.manochaacademy.com/chemistry/periodic-classification-of-elements/l/triads-and-octaves

@alibhaiofficial9465

5 жыл бұрын

here what is the meaninig of A/Q?

@dikshaborthakur2154

5 жыл бұрын

A/Q means according to question

Sir I am very thankful for this video it is helping me very much In our school I listened it's not understood by me

Q1 = 3triads Q2 = 136u Q3 = it was applicable till calcium and Co and Ni are placed in column of F , Cl and Br which is not having similar properties And Thank you sir ☺️☺️

Yous explanation is super and I AM impressed 👍👍

Sir , please make the video on mendeleev 's & modern periodic table pllllllllllllzzzzzzz

Sir you are the best teacher

@ManochaAcademy

4 жыл бұрын

Thanks

@zixtro7568

4 жыл бұрын

Yeah bro..

I am a teacher and your videos has helped me a lot in my teaching process.

Best teacher doesn't exi-😳❤️

Q1 - 3 triads Q2 - C=136 Q3 - 1=only valid till Ca(calcium) 2=he assumed that there are only 56 elements in nature and when more elements has been discovered, they did not fit the newland's law of octave.

Super explinationn way i understand very very well thank u so much sir please do more videos don, t stop the way u helping like me many students

@ManochaAcademy

4 жыл бұрын

Keep watching

Q1 3 Q2 136 Q3 upto calcium there was only applicable of resembling eigth element And There were cobalt and nickhel in the 1st slot, which does not has the propeety of that slot

Thank you sir for your beautiful explanations it's too much helpful to me

Thanks sir for your wonderful explanation I will definitely share this video to my friends also

@ManochaAcademy

3 жыл бұрын

Always welcome

Thanks teacher keep going from somalia one love

@ManochaAcademy

5 жыл бұрын

Happy to hear that you liked the video! Thanks :)

can you tell me how did the atomic mass of the 2nd element of Dobereiner's 2nd triad becomes 80? because when i calculate it the answer that came out is 81.25 not 80

Good explanation sir being an SSC 10 class student I had get this chapter good

Q1.there were only 3 triads Q2.Z of C element is136 Q3. 1.this law is only valid till calcium 2.Newlands had designed his octave table for only 56 elements but after this table many elements had discovered for that discovered elements octave rule is not suitable Please check my answers whether these are correct

SIR I always like your vedios .*THANK YOU SIR FOR TEACHING US PRACTICALLY ALL THE CONCEPTUALTHINGS*

@ManochaAcademy

3 жыл бұрын

It's my pleasure

Thanks for your explanation..it is very nice

Thank you sir for making concepts easy 🙏

Q1: The no of triads identified by dobereiner was 3 Q2 average of A and B = Atomic mass of C 40+88/2=128/2=64 Q3 1. Newland law of octaves was only applicable till calcium 2. At that time only 56 elements were known so the Newland law of octaves was applicable only till the 56th element. It worked well only with lighter elements which is till calcium.

Sir because of your excellent teaching our school is providing your videos in lockdown... Thanks a lot sir🙏👌👌👍

@ManochaAcademy

4 жыл бұрын

It's my pleasure

Thankyou for your time sir and your teaching skill make me your fan. I am the biggest fan of yours. You are the best teacher I ever seen.

@ManochaAcademy

4 жыл бұрын

It's my pleasure

Sir, I could not understand this earlier but you explained so well that I understood everything. Thanks sir . One more thing you are so calm and handsome 🤠

Sir, Could you make a video on Static Electricity?!

Answer: 1) 3 triads 2) 136 is atomic mass 3)A) Laws of octaves worked well till calcium only, B) Newlands assumed that only 56 element existed in nature, but new element came up and doesn't fit into law of octaves.

@jpkl4766

2 жыл бұрын

😃

it is intersting vidio and thank you for your explanation Top 3 question concerning about periodic table Q1 Three B/c law of triads means 3 elements Q2 according to Doberner law the atomic mass of the middle element is the avarage of the frist and the therd incas atomic mass ofA+atomic mass of C divided by two gives B massB=massA+massC/2 88=40+mass C/2 88×2=40+massc Mass of C=88×2-40 136g/mole Q3 1)He pleaced two elements in one place 2) the law applicable for only light element

@ManochaAcademy

5 жыл бұрын

Happy to hear that you liked the video! Thanks :) Very good! Answers of Q2 and Q3 are correct!! Q1 answer is 3 because Dobereiner could identify only 3 groups (triads) at that time (see the 3 triads in the video). Each triad contains 3 elements. Also try the Quiz for this video on my Website. Quiz button is below the video: www.manochaacademy.com/chemistry/periodic-classification-of-elements/l/triads-and-octaves

This KZread channel is very helpfull

Q.1 = 3 Traids, Q.2 = 136, and Q.3 = Newlands assumed that there are only 56 elements in nature, only valid till Calcium (Ca), put two elements in one slot like Co and Ni and Ce and La which were not supposed to be in it........ answer from Tanaaz.J

1. 3 traids 2. C-136 3. Newlands law of octaves only applicable up to calcium. Newlands assumed there are only 56 elements in nature but later new elements were discovered which is not fit into law of octaves.

You Have Best Teaching Way And Excellent Explaining With Your Vdo

@ManochaAcademy

5 жыл бұрын

Great to hear that you liked the video :) Thanks a lot!! Do check out more videos at www.manochaacademy.com

Thank you sir I can easily by watching your videos

1.3 2.136 3.•only valid till calcium •two element are placed in one slot •newland's assumed that there are only 56 elements in nature

I like your teaching skill. And I shared your your channel's link to all my friends. Thanks for teaching in this way.. 🙂

@ManochaAcademy

2 жыл бұрын

Most welcome

Excellent quality of video and Nice explanation

Very good explanation sir ❤ thank you sir for this video

Sir your explanation clears all my doubts. Sir really you're awesome 👌👌👌👌

@ManochaAcademy

4 жыл бұрын

So nice of you

@mrsham100

3 жыл бұрын

@@ManochaAcademy Hindi bhi plzzz

Hey friends😀! I think most of the one have done mistake in 2 questions the answer is 136 not 64 because the second element is the average of 1st and third element according to the question they gave 1st and second so we have to make some changes in the formula B=A+C/2 C=2B-A ON SUBSTITUTING WE GET C= 136

@tsblkpik1920

2 жыл бұрын

Ur correct

@licho5929

2 жыл бұрын

u r correct dude

@keerthanakeerthi5713

2 жыл бұрын

How we will get 136..iam not getting it..I was getting 64..can u tell me plz how would u get it..

@tsblkpik1920

2 жыл бұрын

In A,B,C they have given A(40), B (88) we should find C A+C whole /2 is =B 40+C/2 =88 40+C=88×2 40+C=176 C=176-40 C=136

@Sk_-ti1kn

2 жыл бұрын

@@keerthanakeerthi5713 if there are three elements according to the question the three elements are A,B,C according to Döbereiner he said that in a triad the 2nd element according to question it is B the atomic mass of B is approximately equal to the average of the first and third element atomic mass which is A and C in the question they gave the atomic mass for the elements A and B and they asked us to find C's atomic mass so the formulas for finding average is B=A+C/2 so we should derive the formula, 2B=A+C A+C=2B C=2B-A -----(1) ON SUBSTITITUTING ON EQUATION (1) WE GET C=2(88)-40 C=176-40 C=136 HOPE YOU UNDERSTOOD😄 IF YOU HAVE ANY DOUBTS ABOUT MY EXPLANATION PLS ASK I AM READY TO ANSWER

1-5 2-(40/2+x/2=88)=(x/2=88-40/2)=(x/2=68)=(x=68×2)=(x=136)• 3-it was found that the law of octaves holds good only for the elements up to calcium.Sertain elements, totally dissimilar in there properties,were fitt into the same group.

Thank you so much sir. I am still in grade 8 and sir these lessons are very easy and fun when you teach us. Thank you sir

Sir ur teaching is simply superb and I subscribed only ur channel in you tube ....thank you sir..

@ManochaAcademy

4 жыл бұрын

Thanks and welcome

@prakasamv2364

4 жыл бұрын

☺

Sir I like your teaching That I could understand every topic easily

@ManochaAcademy

4 жыл бұрын

Glad to hear that

Sir one teacher of mine told me that newland placed all the 56 elements in his periodic table that were known at that time but you told in this video that the law of octave was reliable on up to calcium then how did he classified all the known elements ??

Amazing explanation 😀

This concept is really difficult sir but u taught very easier........thank u sir🥰 keep rocking sir

@ManochaAcademy

4 жыл бұрын

Most welcome 😊

@sujatamuddu4109

4 жыл бұрын

@@ManochaAcademy s sir

Wao sirrr I am so happy 🤗🤗🤗after long tym.. Sir plzz your video is really v. Helpful for understanding easily plzz its my request make more video

@ManochaAcademy

5 жыл бұрын

Thanks a lot! Happy to hear that you like the videos :) I'll definitely upload more videos!

It is very helpful for my IIT exam

this video is very useful sir thankyou so much

Sir u teaching is fantastic 😊

@ManochaAcademy

7 ай бұрын

Thanks a lot 😊

Your explanation is osm

Your practical version is super cool then other youtubers lecture

@ManochaAcademy

3 жыл бұрын

Thanks for liking

Thank you sir this helped me a lot Thank you very much

Nothing to say.......except fabulous explaination....... ❤️

@ManochaAcademy

2 жыл бұрын

Thanks

Sir I had an head ach when I had a test I saw your vedios and got a clarity THANKS SIR 👌 🙏

@ManochaAcademy

3 жыл бұрын

It's my pleasure

@tanvimanchala4485

3 жыл бұрын

Thanks a lot sir 🙏🙏

Q.1.3 2.137 3.i-Only valid till calcium ii-Put 2 elements in one slot. Excellent sir and thank you

Thankyou for best explanation