Thallium is the largest and the heaviest element of the group 13 family. The metal and its compounds are dangerously toxic, even at low levels. It is a cumulative poison, and the lethal dose is considered to be about 13 mg of thallium for each kg of human body weight (or less than 1g of a thallium compound in a single ingestion).
Define thallium. thallium synonyms, thallium pronunciation, thallium translation, English dictionary definition of thallium. n. Symbol Tl A soft, malleable, highly toxic metallic element, used in photocells, infrared detectors, low-melting glass, and formerly in rodent and ant...
Thallium is a soft, malleable, lustrous silver-gray metal with a hexagonal close-packed crystalline structure. A member of Group 13 of the periodic table, it resembles aluminum in its chemical properties.
The English chemist and physicist Sir William Crookes (1832-1919) discovered the element thallium and invented the radiometer, the spinthariscope, and the Crookes tube. William Crookes was born in London on June 17, 1832.
thallium 201 a radioactive isotope of thallium having a half-life of 3.05 days and decaying by electron capture with emission of gamma rays. It is used as a diagnostic aid in the form of thallous chloride Tl 201 .
Thallium(I) sulfate, also known as thallous sulfate, is a chemical compound. ... Thallium sulfate, like all thallium compounds, is very toxic. ... Kiddle encyclopedia articles are based on selected content and facts from Wikipedia, rewritten for children. Powered by MediaWiki.
Encyclopedia; Isotopes_of_thallium; Isotopes of thallium. Thallium (Tl) has 25 isotopes which have atomic masses that range from 184 to 210. 203 Tl and 205 Tl are the only stable isotopes and 204 Tl is the most stable radioisotope with a half-life of 3.78 years.
Handling, Storage, and Precautions: thallium reagents are extremely toxic.The reactions should be carried out in a well-ventilated fume hood, and rubber gloves should be worn. Thallium(I) acetate is reported as a human poison by unspecified routes. 4
Characteristics. Thallium is very soft and malleable and can be cut with a knife at room temperature. It has a metallic luster, but when exposed to air, it quickly tarnishes with a bluish-grey tinge that resembles lead. (It is preserved by keeping it under oil).
THALLIUM (REVISED) Note: This article, originally published in 1998, was updated in 2006 for the eBook edition. Overview Thallium is a member of the aluminum family, Group 13 (IIIA) on the periodic table .
Alternatively, a dichloromethane solution of iodine (1 equiv) is added dropwise to a stirred suspension of thallium(I) acetate (1 equiv) in dichloromethane containing the alkene (1 equiv) and the mixture worked up to give the vic-iodocarboxylate.
Thallium(I) oxide is the inorganic compound of thallium and oxygen with the formula TlO in which thallium is in its +1 oxidation state. It is black and produces a basic yellow solution of thallium(I) hydroxide (TlOH) when dissolved in water. It is formed by heating solid TlOH or TlCO in the absence ...
Thallium: 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 …
Thallium(I) sulfate (Tl 2 SO 4) or thallous sulfate is the sulfate salt of thallium in the common +1 oxidation state, as indicated by the Roman numeral I. It is often referred to as simply thallium sulfate. Thallium(I) sulfate is colourless, odourless, tasteless, and highly toxic.
Indeed, thallium poisoning has been called the "poisoner's poison" since thallium is colorless, odorless and tasteless; its slow-acting, painful and wide-ranging symptoms are often suggestive of a host of other illnesses and conditions.
Rats fed levels as low as 0.003% thallium acetate or 0.0035% thallic oxide exhibited a marked growth depression after 30 days on the diet. The major clinical finding at this level was an almost complete depilation.
Nuclear stress test is an imaging method that uses radioactive material to show how well blood flows into the heart muscle, both at rest and during activity. How the Test is Performed This test is done at a medical center or health care provider's office.
Thallium is a chemical element in the periodic table that has the symbol Tl and atomic number 81. This soft gray malleable true metal[?] resembles tin but discolors when exposed to air. Thalium is highly toxic and is used in rodent and insect poisons but since it can also cause cancer, this use has been cut back or eliminated in many countries.It is also used in infrared detectors.
Notable characteristics This metal is very soft and malleable and can be cut with a knife. When it is first exposed to air, thallium has a metallic luster but quickly tarnishes with a bluish-gray tinge that resembles lead (it is preserved by keeping it under oil). A heavy layer of oxide builds up on thallium if left in air. In the presence of water, thallium hydroxide is formed.
Thallium in the organism.Thallium is always present in plant and animal tissue. Its average content in the soil is 10 –5 percent, in seawater 10 –9 percent, and in animals 4 × 10 –5 percent. In mammals, thallium is readily absorbed from the gastrointestinal tract, accumulating mainly in the spleen and muscles.
Thallium is a moderately reactive metal. It corrodes easily in air with a blue-gray color that is similar to lead.If it is kept in air for a long time, a large amount of thallium(I) oxide will build up. It corrodes in the presence of water to make the hydroxide.
Thallium(I) hydroxide, also called thallous hydroxide, TlOH, is a hydroxide of thallium, with thallium in oxidation state +1. Thallous hydroxide is a strong base; it is changed to thallous ion, Tl +, except in strongly basic conditions.
The thallium is usually precipitated and recovered as a sparingly soluble salt (cementation thallium and thallium amalgam) from liquors produced in a variety of concentration methods, with and without pretreatment, and also from liquors that are themselves the raw materials.
Thallium(I) oxide is the inorganic compound of thallium and oxygen with the formula Tl 2 O in which thallium is in its +1 oxidation state. It is black and produces a basic yellow solution of thallium(I) hydroxide (TlOH) when dissolved in water.
THALLIUM [[[symbol]] Tl, atomic weight 204.0 (0 = 16)], a metallic chemical element. It was discovered in 1861 by Sir William Crookes, who, during a spectroscopic examination of the flue-dust produced in the roasting of seleniferous pyrites occurring at Tilkerode in the Harz, observed a …