Thallium Information
Scroll Down To Download
Thallium Element
Thallium is a chemical element with the symbol Tl and atomic
number 81. It is a gray post-transition metal that is not found free in nature.
When isolated, thallium resembles tin, but discolors when exposed to air.
Chemists William Crookes and Claude-Auguste Lamy discovered thallium
independently in 1861, in residues of sulfuric acid production. Both used the
newly developed method of flame spectroscopy, in which thallium produces a notable
green spectral line. Thallium, from Greek θαλλός, thallós, meaning "a
green shoot or twig", was named by Crookes. It was isolated by both Lamy
and Crookes in 1862; Lamy by electrolysis, and Crookes by precipitation and
melting of the resultant powder. Crookes exhibited it as a powder precipitated
by zinc at the International exhibition, which opened on 1 May that year.[4]
Commercially, thallium is produced not from potassium ores, but
as a byproduct from refining of heavy-metal sulfide ores. Approximately 60–70%
of thallium production is used in the electronics industry, and the remainder
is used in the pharmaceutical industry and in glass manufacturing.[5] It is
also used in infrared detectors. The radioisotope thallium-201 (as the soluble
chloride TlCl) is used in small amounts as an agent in a nuclear medicine scan,
during one type of nuclear cardiac stress test.
hallium was discovered spectroscopically by Sir William Crookes,
an English chemist, in 1861. Crooks had obtained the sludge left over from the
production of sulfuric acid (H2SO4) from a friend. After removing all of the
selenium from the sludge, he inspected it with a device known as a spectroscope
to look for signs of tellurium. Rather than seeing the yellow spectral lines
produced by tellurium, he observed a bright green line that no one had ever
seen before. He named the new element that was producing the green line
thallium, after the greek word for 'green twig', thallos. He isolated samples
of thallium the next year. Thallium is found in the minerals crooksite
(CuThSe), lorandite (TlAsS2) and hutchinsonite ((Pb, Tl)2As5S9), but is usually
obtained as a byproduct of the production of sulfuric acid or as a byproduct of
refining zinc or lead.
Movies ColdStar is The Best
Website/Platform For Hollywood HD Movies. We Provide Direct Download Links For
Fast And Secure Downloading. Just Click On Download Button.
Comments
Post a Comment