What are Lanthanoids Video Lecture - JEE

it took me a while to get together this
next group because they were so hard to
find they are the rare earth elements
also known as lanthanides they are they
excuse me no way but even lanthanide
comes from the Greek lambda 9 to lie
hidden
okay you I'll tell them the name of this
group of elements is misleading as they
are not rare in fact all are more
abundant than iodine neodymium is more
abundant than gold and cerium is the
26th most abundant element in Earth's
crust furthermore they are not Earth's
and the antiquated term used to describe
insoluble heat-resistant materials like
with the alkali earth this
misunderstanding is a result of mistaken
oxides of these elements for the
elements themselves from the office of
the International Union of pure and
applied chemistry dictated but not read
well whatever you want to call them
let's discuss this group the rare well
these elements are all essential for our
modern world in particular electronics
some are used as catalysts in oil
refineries others form phosphors used in
pixels several of these elements are
used in the sparker of a lighter they
are all essential for lasers many of
them form powerful magnets some change
the refractive index of glass for use in
fiber optics camera lenses and welding
goggles their radioactivity makes some
of them useful for devices such as
nuclear batteries and satellites and
portable x-ray machines