Periodic Classification of Elements
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- Опубликовано: 4 ноя 2024
- Periodic Classification of Elements: Let's explore Dobereiner's Law of Triads and Newland's Law of Octaves in this video! In the history of the Periodic Table, these were the initial attempts to group elements. We also discuss why do we need to classify elements and the need of a Periodic Table in Chemistry.
Try the Top 3 Questions at the end of video and write your answers and doubts in the comments below!
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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.
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 💯
You are the best teacher on RUclips i have found till now!
Thanks a lot :) Do check out my website : www.manochaacademy.com
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
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 .....
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.
Glad it helped! My name is Sandeep Manocha
@@ManochaAcademysir I know that manocha but now I got to know that before manocha Snadeep is their
@@ManochaAcademy how to find out 2 question
Let him study himself idiot.. he is in 10th std
@@firegamingadi4010 Its easy
Just add 40 and 88
40+88/2 = 64
Hope it helped
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.
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.
You are most welcome
Lie
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@@senthilkumar8702 ravi?
@@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
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..
👏
🎉
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. (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.
Calcium was the 17th element at that time
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It's really easy for me now..Thank u
It's my pleasure
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
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Keep watching
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Most welcome
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
You teach the various concepts practically hence we can understand easily
Thanks a lot :)
@@ManochaAcademy sir Hindi me bhi bolo
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 😌
Thank you so much for the explanation. ❤️
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Thanks
Yeah bro..
with this video all my queries are all solved ..........
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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.
A3 - It's 56 elements not 53 elements dude
Nothing to say.......except fabulous explaination....... ❤️
Thanks
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Minblowing 🎉🙏 keep going sir
Thanks for liking
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
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
Sir your explanation clears all my doubts. Sir really you're awesome 👌👌👌👌
So nice of you
@@ManochaAcademy Hindi bhi plzzz
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 🤩
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
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.
Sodium(Na) was the 9th element at that time (Newland's laws of octaves)
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
Thank you so much 😀
sir your teaching is so nice and it just makes the concept clearer and easier for me.
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.
Your practical version is super cool then other youtubers lecture
Thanks for liking
Sir I like your teaching
That I could understand every topic easily
Glad to hear that
Q.1.3
2.137
3.i-Only valid till calcium
ii-Put 2 elements in one slot.
Excellent sir and thank you
Thanks sir for your wonderful explanation I will definitely share this video to my friends also
Always welcome
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.
It's my pleasure
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.
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 ☺️☺️
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.
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.
Thanks teacher keep going from somalia one love
Happy to hear that you liked the video! Thanks :)
Ans .1 = 3 triads
Ans .2 = 64
Ans .3 = a) = only valid till calcium
b)= put two elements in one slot .
Amazing explanations .👏
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..
B = A+C/2
so
B x 2 = A+C
88x2 = 40 + C
176 - 40 = C
Hence, C = 136
@@adarshraj4696 yess but I did like
40+c/2=88
So 88-40=c/2
48*2=c
C=96
Is this right 🥲
@@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.
@@gooooooooooooooooooooooo no broh!..
We can't take the 40 like that
This concept is really difficult sir but u taught very easier........thank u sir🥰 keep rocking sir
Most welcome 😊
@@ManochaAcademy s sir
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
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
Keep watching
Sir I had an head ach when I had a test I saw your vedios and got a clarity
THANKS SIR 👌
🙏
It's my pleasure
Thanks a lot sir 🙏🙏
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...
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
Thank you for your explanation sir. U are the best teacher ever
You are most welcome
Top 3 Questions {My Answers}
1) Dobereiner identify 3 Triads.
#Lithium , Sodium , Potassium.
#Chlorine , Bromine , Iodine.
#Calcium , Scrontium (In book) and Barium.
2)B = A+C/2 = B×2-A= C => 88×2-40 = 176-40 = 136
3)Drawbacks of Newland's Law of Octaves :
#In the place of one element , he placed two elements.
#His law can only acceptable to lighter elements.
#He placed Iron {Fe} in a wrong place , which means Fe cannot be have the same chemical properties of other eight elements on the table.
Eagerly waiting for your Reply Comment Sir.
👏👏👏
It's strontium.... I think ur book is wrong... Good answers...
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Thanks and welcome
☺
I like your teaching skill. And I shared your your channel's link to all my friends. Thanks for teaching in this way.. 🙂
Most welcome
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.
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
Yous explanation is super and I AM impressed 👍👍
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
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.
Sir I am new to your channel. I was worried about this chapter but you solved my problem .your explanation literally wonderful. Thanks .
Sir because of your excellent teaching our school is providing your videos in lockdown...
Thanks a lot sir🙏👌👌👍
It's my pleasure
Perfect explanation... thankyou sir!!
1) 3 triads
2) 136
3) two elements were placed in the same column and also those elements differed from the other elements in the column in its properties. And the table was valid only for lighter elements until Calcium ..Newland assumed that only 56 elements existed in nature,which was wrong .
SIR I always like your vedios .*THANK YOU SIR FOR TEACHING US PRACTICALLY ALL THE CONCEPTUALTHINGS*
It's my pleasure
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
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
Great to hear that you liked the video :) Thanks a lot!! Do check out more videos at www.manochaacademy.com
You teaches very well sirr
Glad you are liking it.
Best teacher doesn't exi-😳❤️
Sir, Could you make a video on Static Electricity?!
Thank you sir for making concepts easy 🙏
Answers for the top three questions :-
Ans:1:- Dobereiner identified only three traids out of the known elements.
Ans:2:- Elements:A, B, C.
According to Dobereiner,
(atomic mass of A + atomic mass of C) / 2 = atomic mass of B
40 + atomic mass of C = 88 *2
Atomic mass of C = 176 - 40
Atomic mass of C = 136
And:3:- Issues with Newland's Law of Octaves :-
a) Newland's Law of Octaves was valid for elements upto Calcium only.
b) He assumed that only 56 elements are present in the environment and no more elements would be discovered later.
Thank you sir
Your teaching style is fantabulous
Thanks and welcome
Good explanation sir .....
Thankyou
It helped me a lot...
💛
Glad to hear that
I am a teacher and your videos has helped me a lot in my teaching process.
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 your teaching is very nice thanks for explaining this concept .my concepts are cleared by seeing ur video
Glad to hear that
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
Thanks a lot! Happy to hear that you like the videos :) I'll definitely upload more videos!
Very nice teaching sense sir I understood very richly in the lockdown period.👍👍👍👍👍👍👌👌👌👌👌👌🙏🙏🙏🙏
Great
@@ManochaAcademy sir u did not reply to the answers.......
Answers for the top three questions.
1. He identified three triads.
2. 136. Working => 88=40+C/2 ---> 88 x 2 = 40 + C -----> 176 = 40 + C -----> C = 176 - 40 = 136.
3. These laws were valid only till Calcium.
Dissimilar elements were fitted into the same slot.
THANK YOU SIR.....I WAS ABLE TO UNDERSTAND ONLY THROUGH YOUR VIDEOS
Glad to hear that
Tq sir😎
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.
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
here what is the meaninig of A/Q?
A/Q means according to question
Proud to have Indian teacher like you
Thanks for liking
Amazing session sir
Answers
1. 3 triads
2. 136
3. This method was possible only till calcium.
He didn't know that in future more elements were to be formed, hence he didn't leave much space in the table.
I missed the part where that’s my problem!!!
1. 3
2.136
3. It was a issue of an 56 elements but there were more discover of elements in future it was not fixed for his table
Sir,Ur teaching is very good
U need millions of subscriber
Thanks a million
1ans = 3 trafis
2ans = 136 is c
3ans = 1.every 8th elements starting from a given elements resembles in its properties to that of starting element. Elements are in horizontal row
2.every period starts nitha new she'll and ends when the shell is filled.newland's laws of octaves is similar to octet configuration
Thankyou sir to make this video.. this video has really helped me a lot.once again thankyou sir 🤧🤧
Yes
Most welcome 😊
Thank you for this wonderful video Sir...........
Great to hear that you liked the video :)
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).
answer in 136 for the 2nd one
3 Triads
Atomic Mass of The element c is 136
Issues with law of octaves:-
Only applicable till Calcium, He fitted two elements in 1 place
THANK YOU SIR!!!! YOU EXPLAIN WELL
Thanks very much for your intresting teaching sir tq
Thanks and welcome
1. Dobereiner could identify 3 triads.
2. I got the answer as 136
3. the laws or properties stated were followed until calcium, two elements were added together in one slot and iron (Fe) which is related to these elements was situated very far. Also later when more elements were found, even they couldn't fit in the table.
Q1-Dobereiner identified only 3 triads
Q2-In order to find the atomic mass of the third element we need to use the following equation;
[40+c]/2=88
40+c=88x2
c=176-40
c=136
Q3-The first issue was that it was only valid till calcium and the second issue was that it wont be able to fit in the elements that were discovered later on
thank you sir, your explanation is so good helped me a lot!
Most welcome!
1. 3 triads
2. 136
3. (i) Newland's law of octave act true only for elements up to Ca .
(ii)The elements that were discovered later could not be fit into the pattern.
Thank u sir i like ur way of teaching and good explaination
It's good
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
Thank you teacher of manoch acadamy for periodic table explanation
Great to hear that you liked the video :)
Sir , please make the video on mendeleev 's & modern periodic table pllllllllllllzzzzzzz