Do subscribe to Ekeeda  Channel and press
bill icon to get updates about latest
engineering HSC and IIT JEE main and
advanced videos Hello Friends in the last
section we have studied about what is
atomic radius and what are the text or
we could say or other variation that you
could see in the property atomic size
when it comes to the periodic table so
now we are going to talk about ionic
radius and its variation or and its
trends that we are observing in the
periodic table so what are those let us
talk about that
so let us see what is actually ionic
radius as I mentioned earlier also that
it is the distance between the nucleus
and the outermost valence shell of an
ion so as I have mentioned earlier also
that the I M is been now distributed
into two paths as you know that is gonna
scatter N 1 is n N and that what we have
got to move we have got to know that the
cation is smaller than that of its
parent time when it comes to an end and
then is having a more size compared to
that of its parent atom so now in this
case what we are going to talk about we
are going to talk about the trends or
the variation that we observe and
whatever the variation that we observe
in periods and in groups let us talk
about that also so ionic size is similar
to that of the atomic size so it is
similar to that of the atomic size that
we have did earlier also so atomic size
and the ionic size they don't differ a
lot when it comes to the trend how
because atomic size is nothing but when
it comes to the distance between the
nucleus and the outermost shell or
dimension what dynamic size is just for
the distillate in the nucleus and the
outermost shell often I am and that can
be more or that can be less also
compared to that often and so let's talk
about the first thing that is what will
happen when we are talking about the
trend or the variation that we observe
in period so whenever we say that what
would be the atomic what would be the
ionic size in terms of period then what
we see is in the period as the atomic
number increases the atomic size also
increases so therefore this says that
atomic number increases
and gradually impeded but when we are
talking about I
so basically when it comes to I'll also
again we will say that the atomic number
will be nothing but it will be nothing
the number of protons that is present in
an atom or present in an ion because the
number of protons will be the same in
that case so therefore if the number of
atom increases it will increase
gradually and we could see that the
atomic size will go on decreasing and
moreover it is it it has suppose if it
has a positive child or when we are
talking about a cation so cation will
have one electron less at least one
electron less so what will happen in
that case in that case the atomic size
will reduce more compared to that of
then atom so this will lead to the
atomic size to decrease more effectively
when it comes to a period and that is
the reason the atomic size or we could
say for ionic size in period actually
ionic size decreases because even the
nuclear charge will go on increasing
because if the electrons have been
removed from the atom first to form n
attend so in that case what happens is
the nuclear charge will increase and the
atomic or ionic size will go on
decreasing so similarly when we are
talking about in group so into what
happens again when we are talking about
atomic size or ionic size in this case
so again it will be similar to that of
the atomic size that we have observed
because as the number of electrons goes
on increasing or as the number of
electrons have been added in the
elements or the atoms of the element
when we come to up to down down the root
so the number of electrons goes on
increasing and because of that the
number of shells will also go on
decreasing but when we are talking about
M cation again it will be showing the
similar behavior that of the atomic
friend that we have so in our earlier
lecture that is the size of the atomic
size will go on increasing
similarly in that case in this case also
the ionic size will go on increasing
when it comes to now the group so this
trend will make us to know that it is
very similar to that of the atomic size
so therefore in this case we could
conclude that the atomic number goes on
increasing but talking about the ionic
size so ionic size in groups also goes
on increasing so this will go on
increasing similar to that of the atomic
size so thank you friends for watching
this video I hope you have understood
this concept very clearly so you share
this with your friends and s don't
forget subscribe we can thank you so
much
