Ionic radius & Isoelectronic properties - Elements & Periodicity Video Lecture - Class 11

hello friends this video on
classification of elements part 16 is
brought you by exam clear calm no more
fear from exam before watching the video
please make sure that you have watched
part 1 - part 15 will talk about the
ionic radius known so what is ion so if
you have any here Adam you take out
electron or you add a electron right so
you get ions
so you get cations or anions okay so you
add one negative ion so you get an anion
is nothing but if you see anion is
o-negative and there's a fill from anion
or negative I right
so one with negative charges and I
please don't confuse your confused with
an iron a time please note an iron means
a negative I I am it has negative charge
that means it has gained one electron
per example CL minus is the anion and a
plus is a cation right so an ion is our
negative charge the one with the
negative charge right so you get
negative charge when you gain an
electron so anything which is not
neutral any if atom which is not to do
which has negative a positive charge
MacColl ions and we'll talk about
anything is ionic radii also exhibit the
same weight trainers and in radius
because all the more concept is same
right the only thing is got extra charge
but the concept remains same it has got
neutrons and got electrons the neutron
gated clock electrons interacted from
neutrons and if you go along the period
the neutrons power increase and they
attract electrons all the more in the
get strength right the electrons get
string column if you go down the group
the shells are added and the shells are
added so the size same concern right
also note that a cation is smaller than
paratime why because if you see in the
case of cation
the protons is saying but one electron
is less right so one electron is less
overall they get it right more because
the energy which this Neutron was
spending on attracting one electron is
gone no it is not required to the energy
which is left the same force can be used
to attract other electron on the moon so
the cation size will be so we understand
this example this guy that are acting
like suppose for length and each of
these then suppose five electron and it
has 100 units of force so each guy was
getting laid suppose 25 units each one
guy is gone there's four electrons to
attract it does hundreds of energy or
hundred subpar so you should get 25
minutes for track so all these will come
ready closer why because they have a
track and a do both wait it is each one
is getting more so the size of
Ottoman strength this is a logical
discussion this thing actually doesn't
happen in the real world of atom the
structure a little complex there's so
many orbitals and all so there things
are little complex but just to make the
culture clear I am using this a very
basic way of explaining and we have one
no nucleus which has some unit of charge
should attract so since the electrons
are less so it can attract the remaining
electrons more power right and for
example if you see this radius of sodium
is why it is Pico meter but anyway since
95 people just half in case of an eye on
the negative charge the size of an ion
will be larger than the period why
because when extra electron is there and
the neutron has to support one extra
electron so it will not be able to give
enough power to the remaining to the
existing electron the power of Newton
will be divided and each of this
electron will experience it
force and they'll go out so the size
will also increase also we see the
moment you add extra electrons will be
repulsion among the electrons where the
other electrons won't want is tried to
come with a person and with that also
the size will increase all right so you
see chlorine - has one that is speak of
it as the size but chlorine has only 72
because now will understand
isoelectronic species so atoms and ions
just same number of electrons are called
isoelectronic species we will see some
trends in the ICC's example of i
circling sneezes OH - - f - na plus mg
plus 2 they all have 10 electrons but
their size value Y the radius will vary
because the charge is very so easy show
these have different positive charge
correct since i'm an oxygen has 8
positive shock
fluorine has 9 sodium is live 9 semester
the positive charge Val's so size but
also well so in this case this guy will
be smallest and this guy will be largest
why because two little protons can track
10 electrons closely and 8 protons will
not be able to attract a little toss is
me so it will expand example this is a
eight so they are ten one two three four
five six seven eight nine ten
actually it is not like this in the real
world it is the HP orbital shape just to
understand the cause of everything like
this this guy is 12
they dragged correct because they still
it gave more part attract these limos
both possible this there will not be
- electrons as for clear there so in the
zygonians
will take my example we show the
following species at the largest and
smallest size correct first let's see
the non charge nanny shimon l they are
part of third period okay so I have a
Magnus in here I have my as I told that
if you go across the period size
decrease so I'll right here decrease I
suppose magnesium is this much and again
business so two elements are at boosting
right and then I say I get L plus three
so al plus three will be even smaller
than L being correct how gets told that
cation will have less electrons the
moment laugh less electron but a single
bit of neutrons attract all the more so
L plus three will be somewhere here so I
have put these three now I am mg plus 2
so mg plus 2 will be smaller than my
knees that is for sure
so it will be something here but I'm not
sure whether it will be here here or
here I don't know I don't know where it
will be right I don't know the exact
position of mg plus 2 but now let's
compare mg plus 2 and a 3
so mg plus 2 has magnesium 12 neutrons
and 10 electrons and aluminum plus 3 has
30 neutrons and 10 electrons this guy's
more neutrons dissolve isoelectronic
correct so I select only they have seen
electrons but this guy has more neutrons
we'll be smaller that is for sure that
this can't be here because mg plus 2 is
bigger than ILP l vastly smaller so al
plus 3 has come to be here so mg plus 2
can be here or here but can I actually
find where is mg plus 2 not able to find
so let's see if I need to answer with
this data only or not right so I have
this two option one series he is mg mg
plus two al KL plus three is one option
or the other series i can think of is l
mg l mg equals two it L plus correct two
option I can think of let's see if with
this I can answer the question which has
the largest size on both case larger
sizes for a mg largest which has smaller
size here plus C so with this also I am
going to answer the question because it
does not matter which option I pick
because I had two options I was confused
which series to go for but you take any
of the season answer comes out to be
same so for my answer perspective I can
look this data itself I get them that
magnesium mg is largest and this guy is
small but actual trend I am still not
able to tell but it's okay because I
answer question asked me to tell just
the largest and smallest do this I can
tell that my largest is NaN Batian man
small as this ammonium is good thank you
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