Do subscribe to Ekeeda  Channel and press
bell icon to get updates about latest
engineering HSC and IIT JEE main and
advanced videos Hello Friends in the last
lecture we have data about cookies Homologous 
 series and we have also did
Dobereiner's triads and on which we have
got a information that they have played
a very important role in a formation of
periodic  table that we are observing
nowadays but let me talk about the new
lets octave also even that has a very
important tool in arranging those kind
of elements in a particular horizontal
row so let us talk about that
so talking about Newlands law of octaves
what does it say that you're informed
that if the elements were arranged in
increasing order of their atomic weights
the properties of every eighth element
that is the property of every eighth
element we're similar to those of the
first element so and this kind of law
that they have mentioned or they have
arranged this kind of thing is basically
known as Newlands law of of pills so
what does this means let me give you a
short example of this thing so as we
have said that the according to millions
of people the eighth element will have
the similar property with that of the
first element so let me give a short
example of it these are the elements
that have been arranged from
horizontally as you could see and that
is starting from the lithium that is
beryllium boron carbon and it goes on so
what it has been observed that the
lithium barium boron mainly boron carbon
nitrogen oxygen and fluorine they have a
particular atomic weight as you could
see like 7 9 11 12 14 16 19 but talking
about the next group that we have or the
next group of elements that we have
starting from sodium magnesium aluminum
silicon phosphorus sulfur and chlorine
atom so if we would observe that this
lithium suppose if it is the first
element then I call it - it's the eighth
element will be like this one if it is
said to be 1 this would be 2 3 4 5 6 7
well the eighth element would be again
here if we come to the sodium so since
this lithium is the first element and
according to this nudity octave sodium
would be the eighth element so it is
mean easily for us to understand that
the lithium and the sodium will have the
same chemical property and moreover it
has also been found that the lithium and
sodium they are present in the same
group
so therefore this lithium and this
sodium will have the same kind of
chemical property so this was shown by
the Newland Nunez octave the law of unit
something talking about the bell you
even believe suppose if we consider this
to be the first element so therefore
this is the first bar only the second
third fourth fifth sixth seventh and now
this would be the eighth so therefore
beryllium and magnesium this are the
first and the eighth element when we
when we increase the atomic number from
left to right or in the periodic table
or according to them according to the
Newlands octave so this Bailey are in
this magnesium are the first and the
heat element and hence they have a
similar property so the first time in
the eighth that you might have similar
property so this is valid up to this
much only that is a pre tension only if
we could take any one of as a as
consider as the first element so in this
case if I'm talking about the magnesium
if this is magnesium is the first
element then the eighth element would be
the calcium so therefore this is ready
to fill calcium only and moreover what
we have observed is a we did observe the
helium's or the helium neon or those
kind of nobody guesses because this
Newlands octave is only applicable in
calcium as well as it is not applicable
to the noble gases and that's the reason
we can't find noble gases as the eighth
element because as we know impurity
table that lithium beryllium boron
carbon nitrogen oxygen fluorine and
after that it nobody casapierce but here
the no.1 gas has no means the newness of
table is not validated through the noble
gases and by which it has a few
limitations and a p it is only
applicable a calcium only but there are
more than 180 elements
so therefore this was the Newlands of
table and which had made a very vital
role in understanding the arrangement of
the elements in a periodic table and
after that this had really very
important role in the in the formation
of the modern periodic table so this is
what the importance of new let's octane
so thank you for watching this video I
hope you have
the squats are very clearly and you to
share this video difference and it's
probably to subscribe me again thank you
so much
