This week’s element is thallium, which goes by the symbol Tl and the atomic number, 81.
Why is thallium Tl?
The name derives from the Greek thallos for “green shoot” or “twig” because of the bright green line in its spectrum. Thallium was discovered by the English physicist and chemist William Crookes in 1861. Metallic thallium was first isolated by the French chemist Claude-Auguste Lamy in 1862.
What is thallium used for?
Thallium is a heavy metal used in the manufacture of electronic components, optical lenses, semiconductor materials, alloys, gamma radiation detection equipment, imitation jewelry, artist’s paints, low temperature thermometers, and green fireworks.
What is Tl on the periodic table?
thallium (Tl), chemical element, metal of main Group 13 (IIIa, or boron group) of the periodic table, poisonous and of limited commercial value. Like lead, thallium is a soft, low-melting element of low tensile strength. Freshly cut thallium has a metallic lustre that dulls to bluish gray upon exposure to air.
What element has a symbol of RN?
radon (Rn), chemical element, a heavy radioactive gas of Group 18 (noble gases) of the periodic table, generated by the radioactive decay of radium. (Radon was originally called radium emanation.)
Is SB a metal?
Antimony is a semi-metal. In its metallic form it is silvery, hard and brittle. Antimony is used in the electronics industry to make some semiconductor devices, such as infrared detectors and diodes.
Why thallium is called duckbill platypus?
Subsequent work on the chemistry of thallium showed it to have similar properties to several other elements, including silver, mercury and lead. So much so that French chemist Jean-Baptiste Dumas later dubbed it the “ornithorhyncus, or duck-billed platypus of the metals.”
What is 81 on the periodic table?
Thallium (Tl) is a soft gray metal that has the atomic number 81 in the periodic table in Group 13.
What is the chemical symbol of polonium?
polonium (Po), a radioactive, silvery-gray or black metallic element of the oxygen group (Group 16 [VIa] in the periodic table).
Is thallium toxic to humans?
Thallium is considered a cumulative poison that can cause adverse health effects and degenerative changes in many organs. The effects are the most severe in the nervous system.
How much thallium is fatal?
Further support for the chosen IDLH can be gained from the statement by Deichmann and Gerarde [1969] that a dose of 0.2 gram (inorganic salts of thallium) may be lethal unless treatment if started promptly.
How much thallium is toxic to humans?
Thallium poisoning is via ingestion or absorption through the skin. The lethal dose for humans is 15-20 mg/kg, although much small doses have also led to death. Non-lethal doses cause toxic effects. Prolonged exposure may lead to build-up and chronic poisoning.
Is BA a metal?
Barium is a soft, silvery metal that rapidly tarnishes in air and reacts with water. Barium is not an extensively used element. Most is used in drilling fluids for oil and gas wells. It is also used in paint and in glassmaking.
