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Dobereiners triads - p Block Elements, Chemistry, Class 12 Video Lecture
FAQs on Dobereiners triads - p Block Elements, Chemistry, Class 12 Video Lecture
| 1. What are Dobereiner's triads in chemistry? |  |
Ans. Dobereiner's triads are a set of three elements in the periodic table that have similar chemical properties and are arranged in increasing order of atomic masses. These elements show a pattern where the atomic mass of the middle element is approximately the average of the other two elements.
| 2. How were Dobereiner's triads discovered? | |
Ans. Dobereiner's triads were discovered by Johann Wolfgang Dobereiner, a German chemist, in the early 19th century. He noticed that certain groups of three elements shared similar properties and atomic masses. He arranged these elements in triads, where the middle element had an atomic mass close to the average of the other two elements.
| 3. What is the significance of Dobereiner's triads in chemistry? | |
Ans. Dobereiner's triads were significant in the development of the periodic table. They provided evidence for the periodicity of chemical properties and the relationship between atomic masses and element properties. The concept of grouping elements based on their similarities paved the way for the later development of the periodic table by other scientists.
| 4. Can you give an example of a Dobereiner's triad? | |
Ans. An example of a Dobereiner's triad is the group of elements lithium (Li), sodium (Na), and potassium (K). These elements share similar chemical properties and their atomic masses follow the pattern where the atomic mass of sodium is approximately the average of lithium and potassium.
| 5. Are Dobereiner's triads still relevant in modern chemistry? | |
Ans. Although Dobereiner's triads were significant in the early understanding of the periodic table, they are not considered as crucial in modern chemistry. With the discovery of more elements and the development of a more comprehensive periodic table, the concept of triads has been superseded by more precise classification systems based on atomic number and electronic configurations.
Text Transcript from Video
hello friends this video on periodic
classification of elements part 3 is
brought to you by exam fear calm no more
fear from exam before watching this
video please make sure that you have
watched part 1 and part 2 let's study
dominate trials so in 1870 the German
chemist doe veneer you try to arrange
this elements based on similar chemical
properties in two groups and he created
three such groups and each groups have
three elements and he used to call these
groups us try so he showed that when
three elements in it in a tribe are
written the order of increasing atomic
masses the atomic mass the middle
element was almost the average of that
to make Moslem other tool that's what he
do example this is one time where he has
lithium sodium and potassium he has put
all these three in one time because all
these three had similar chemical
properties then he had put this alkaline
earth metal calcium billion all this
thing in one tribe because it had
similar property he also put the
skirmishing metals halogen elements
actually showing bromine hiding all
these in one try it so if you see in
this case if you find that a big mass of
this and this you IDs 239 plus 7 is
almost 46 divided by 2 t 3
you take these also 137 plus 40 divided
by T will get almost similar to a a 7.6
right similarly one point is six point
nine plus thirty five point five divided
by 2 will get seventeen point nine
almost so that's what he had shown a
relation of atomic mass with you can see
properties here you see this guy's all
our pocket they are three pockets even
right and they all based on the chemical
tee's but he also showed that in this
bucket
you take the first and last coming mass
you add them / - you get them billion
that's what a relation between you can
say that atomic mass and on property
property of the element right
this was stablished this was never
stylus first time in 1817 this guy
establish a relation to the make maximum
right but they were limitations to this
da Barnea tribes he could identify only
three such tried and that time please
note 33 elements were known but still it
would find he would fit only you can say
nine elements in his tribes right and he
threw the nine elements he frickin to
try it was not for all only for some but
still he showed some relation between
the atomic mass and the property and
that's why we started this thank you
visit exam viacom to watch free
education videos try free online tests
get the best quality study materials
study from the best tutors and mentors
and much more
thanks once again
classification of elements part 3 is
brought to you by exam fear calm no more
fear from exam before watching this
video please make sure that you have
watched part 1 and part 2 let's study
dominate trials so in 1870 the German
chemist doe veneer you try to arrange
this elements based on similar chemical
properties in two groups and he created
three such groups and each groups have
three elements and he used to call these
groups us try so he showed that when
three elements in it in a tribe are
written the order of increasing atomic
masses the atomic mass the middle
element was almost the average of that
to make Moslem other tool that's what he
do example this is one time where he has
lithium sodium and potassium he has put
all these three in one time because all
these three had similar chemical
properties then he had put this alkaline
earth metal calcium billion all this
thing in one tribe because it had
similar property he also put the
skirmishing metals halogen elements
actually showing bromine hiding all
these in one try it so if you see in
this case if you find that a big mass of
this and this you IDs 239 plus 7 is
almost 46 divided by 2 t 3
you take these also 137 plus 40 divided
by T will get almost similar to a a 7.6
right similarly one point is six point
nine plus thirty five point five divided
by 2 will get seventeen point nine
almost so that's what he had shown a
relation of atomic mass with you can see
properties here you see this guy's all
our pocket they are three pockets even
right and they all based on the chemical
tee's but he also showed that in this
bucket
you take the first and last coming mass
you add them / - you get them billion
that's what a relation between you can
say that atomic mass and on property
property of the element right
this was stablished this was never
stylus first time in 1817 this guy
establish a relation to the make maximum
right but they were limitations to this
da Barnea tribes he could identify only
three such tried and that time please
note 33 elements were known but still it
would find he would fit only you can say
nine elements in his tribes right and he
threw the nine elements he frickin to
try it was not for all only for some but
still he showed some relation between
the atomic mass and the property and
that's why we started this thank you
visit exam viacom to watch free
education videos try free online tests
get the best quality study materials
study from the best tutors and mentors
and much more
thanks once again
About this Video
Oct 19, 2025
Last updated
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