L5 : Say Hello-4 - D & F Block Elements, Chemistry, Class 12 Video Lecture

hello friends this video on D and F
block elements part 5 is brought to you
by exam fear calm no more fear from exam
this is Molly Burnham
this is also my period 5 element as you
can see this is also my silvery metal
and this molybdenum named cream from a
Greek word Molly
dough's and molybdenum in English this
Greek this is English right why because
earlier the molybdenum ores were
confused with the lead horse the horse
we're confused so this name was given
one Atos it was discovered in 1778 and
it generally occurs in the combined
state it has very high melting point in
fact it has six highest melting point of
any mint any element not forget about
the middle emil when this has a sixth
highest building it is again since it is
very hard it is using steel stainless
steel production and also some super
alloys it is used to create super alloys
and it is used as catalyst Molly bit
numb you must have seen some chemical
reaction in nitrogen fixation process we
use Molly witness catalyst since it is
very hard as used to create Indian parts
because engine parts generally the whole
thing happened very high temperature and
you need something which can resist high
temperature so this molybdenum is used
this also uses heating elements in by
the reason is it is it has very high
melting point so it is uses heating
elements and is also using filaments in
the block bulbs why again the same
reason since it has very high melting
point is used as filament
the but the next is technetium see
technetium is again the periodic five
this is the only element in my V block
Ashley which has only radioactive
isotope other elements you will see that
they have stable isotopes also must
thickness shim is the only D block
element which has only radioactive
isotope
it is also silvery gray and crystalline
this word came from a Greek word that is
thick toes take toes means something
which has made artificial technical also
I think word came from the similar word
take take toast something just made
artificially since it was radioactive
and it was made artificially view of
these so it was called technique Ishim
technetium and this is also use the main
primary use of technetium is cancer
detection it is used to detect cancer
for medical diagnosis is something
called pets can see this PET scan is
used for cancer detection in that this
typically we use and radioactive metals
or radioactive elements to redic the
next is to the new see this through the
name is again lustrous it has sign and
it is also silvery white this is inert
to most chemical not much reactive it is
was discovered in 1844 by a german
scientist and it was named after
ruthenium what is ruthenium Ruthenia is
nothing but Latin word for Russia
this ruthenium is named after Russia
actually it is one of the hardest
transition metal it has a couple of
radioactive isotopes in couple of
stabilizers also and the main use of
real name is super conductor operation
it is actually used to create
superconductors talk about the next
element rhodium this is like also my p53
or PI this is rare and this is costly
also this is also silver white it's hard
and this is not much reactive so it is
chemically inert
it has only one naturally occurring
isotope and usually since it is not
reactive it is found in free state
usually free state not in commencing
this is also resistant to corrosion and
this was discovered in 1803 okay now
since this was discovered in Indian
three in a or and this or was a rose
color so it was discovered it was
discarding the old that was closed color
and that's why rose color in green means
Rudy on right from this rhodium word
came okay and the main use of rhodium is
catalytic converter in the cars
so this rhodium actually traps traps my
nitrogen oxide nitrogen dioxide gases
and
gases also since it traps the samehada's
it is used as catalytic converter in
them talk about paradigm palladium is
again rare is also rare and this is
lustrous silvery white metal you see
discovered in 1890 and this is named
after god of wisdom the Greek word of
wisdom Palace Palace is Greek word of
wisdom after him this element is named
you see motion elements are named by the
Greek mythology the elements which are
discovered in 1800 inch they were
discussing about Greek mythology and
you'll see that the later elements the
newly discovered elements are named
after the scientists or Americans City
you see that this was named after the
Greek god of wisdom palace and it
actually converts 90% of the harmful gas
from auto exhaust into less harmful gas
example you have any ch4 methane let's
suppose or you have common oxide nitrous
oxide it will convert this to nitrogen
gas carbon dioxide water so it does
conversion also it absorb 90% of sorry
nine nine hundred times more than its
volume hydrogen it absorbs hydrogen gas
since it absorbs hydrogen gas so 10 or 1
liter of palladium can actually absorb
900 liters of hydrogen so it is a
potential storage for hydrogen in the
future the next is silver silver is
again my
be fine and if we talk about silver it
has silvery look obviously it has the
highest electrical conductivity that is
the best part of silver highest
electrical conductivity of any metals
you talk any element silver has a
highest electrical conductivity not only
electrical it has a highest thermal
conductivity for any metal and highest
electrical conductivity for any element
and in tocker's in pure form also in the
lower form in code and most silver
ashley is produced as a by-product of
gold silver lead zinc so nearly fine
these metals typically you get silver as
the by-product silver is used to make
coins jewelry utensils you must have
seen that and it has stable isotopes to
stable isotopes it has some radioactive
isotopes also and saloon is also used in
medicines and let us talk about the
origin of this word the silver came from
the M Anglo section world actually from
this word see ol for this Anglo section
word and the Latin name of silver is a
gentle you must be knowing it and that's
why we have eg as a symbol of silver
okay the next element is cadmium
scabiosa the silvery bluish look is
solved and you can easily cut with -
very saw discovered in 1870 and this was
discovered as an impurity in zinc so
this was jelly cabins produces the
by-product of zinc production and this
is toxic scandium is toxic and that's
why
the nickel-cadmium battery must have
heard earlier used to use nickel-cadmium
battery now that nickel-cadmium
batteries replaced by a lithium-ion
battery okay and this is not a reactive
but this is also a resistant to
corrosion because this forms oxide film
okay
Norwich talked about the word origin see
there is a Greek mythological character
Callum I calamy I see green method
methodological character and this
methodological character actually is not
good okay and there is a compound zinc
carbonate this is called calamine from
this character now this they torn and
thus cadmium is produced mostly as the
by-product of zinc refining so this
cadmium genymotion Academy produces from
zinc carbonate zinc carbonate is called
calamine and does this word cadmium came
from this calamine mana thank you visit
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