Poisonous thallium is element number 81. Its chemical symbl is Tl. More links in description below ↓↓↓ Support Periodic Videos on Patreon: ...
========== Thallium, because it is heavier, has two different
so-called oxidation states. It can react with one atom
of chlorine per thallium, or say three, and the different
chemistry between thallium-one and thallium-three. Thallium
salts are very poisonous, and there was quite a notorious
case some years ago when a technician at some company, who
turned out to be mad, was discovered to have been poisoning
many of his colleagues with thallium and so, but it is
not a widely used element, apart from a few materials that are
used. There is a rather nice red material that is made of thallium,
which has the rather unromantic name of KRS-5, this
is mixed bromide and iodine with thallium which is used as
windows for many infrared experiments. But because thallium
is so poisonous, one has to be quite careful about...