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| - Thallium was a metallic element used by Imperial engineer Umak Leth to contain molecules.
- Thallium is an element, number 81 on the periodic table. The rock strata on Mintaka III contained a high concentration of thallium compounds. In 2366, Data theorized that it could be obstructing USS Enterprise-D's sensor beams. (TNG: "Who Watches The Watchers" )
- Thallium (atomic symbol Tl) is element 81 on the periodic table. It is a poor metal.
- Thallium, is a soft-poor metal that is highly poisonous, and can cause cancer when exposed to. It is also used in pest and insecticides, from its toxicity. It has a melting point of 579oF (304oC), and has the atomic number of 81 on the periodic table of the elements.
- Thallium is a chemical element (atomic number 81). In it's pure state, it is a silvery grey metal that discolors quickly in the presence of oxygen. Although it is primarily used in electronics, it is also used in nuclear medicine. Both the metal and all of its compounds are highly toxic (see Heavy metal poisoning) and even exposure to the skin is problematic. Deaths from thallium poisoning are fairly common.
- Thallium was a resource that can be extracted from Orthorhombic Crystals, which are located on the mining planet of Aguerra Prime. These are used in making Heim-drive Coil, one of the longest-lasting drive coils.
- Thallium is extremely soft and malleable and can be cut with a knife at room temperature. It has a metallic luster, but it quickly tarnishes with a bluish-grey tinge that resembles lead. It may be 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 has 25 isotopes which have atomic masses that range from 184 to 210. 203Tl and 205Tl are the only stable isotopes, and 204Tl is the most stable radioisotope, with a half-life of 3.78 years.
- Thallium is a chemical element with symbol Tl and atomic number 81. This soft gray post-transition metal is not found free in nature. When isolated, it 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, thallos, meaning "a green shoot or twig," was named by Crookes. It was isolated by electrolysis a year later, by Lamy.
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| abstract
| - Thallium is a chemical element with symbol Tl and atomic number 81. This soft gray post-transition metal is not found free in nature. When isolated, it 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, thallos, meaning "a green shoot or twig," was named by Crookes. It was isolated by electrolysis a year later, by Lamy. Thallium tends to oxidize to the +3 and +1 oxidation states as ionic salts. The +3 state resembles that of the other elements in thallium's group (boron, aluminum, gallium, indium). However, the +1 state, which is far more prominent in thallium than the elements above it, recalls the chemistry of alkali metals, and thallium(I) ions are found geologically mostly in potassium-based ores, and (when ingested) are handled in many ways like potassium ions (K+) by ion pumps in living cells. Commercially, however, 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. It is also used in infrared detectors. The radioisotope thallium-201 (as the soluble chloride TlCl) is used in small, nontoxic amounts as an agent in a nuclear medicine scan, during one type of nuclear cardiac stress test. Soluble thallium salts (many of which are nearly tasteless) are highly toxic in quantity, and were historically used in rat poisons and insecticides. Use of these compounds has been restricted or banned in many countries, because of their nonselective toxicity. Notably, thallium poisoning results in hair loss. Because of its historic popularity as a murder weapon, thallium has gained notoriety as "the poisoner's poison" and "inheritance powder" (alongside arsenic).
- Thallium was a metallic element used by Imperial engineer Umak Leth to contain molecules.
- Thallium is an element, number 81 on the periodic table. The rock strata on Mintaka III contained a high concentration of thallium compounds. In 2366, Data theorized that it could be obstructing USS Enterprise-D's sensor beams. (TNG: "Who Watches The Watchers" )
- Thallium (atomic symbol Tl) is element 81 on the periodic table. It is a poor metal.
- Thallium, is a soft-poor metal that is highly poisonous, and can cause cancer when exposed to. It is also used in pest and insecticides, from its toxicity. It has a melting point of 579oF (304oC), and has the atomic number of 81 on the periodic table of the elements.
- Thallium is a chemical element (atomic number 81). In it's pure state, it is a silvery grey metal that discolors quickly in the presence of oxygen. Although it is primarily used in electronics, it is also used in nuclear medicine. Both the metal and all of its compounds are highly toxic (see Heavy metal poisoning) and even exposure to the skin is problematic. Deaths from thallium poisoning are fairly common.
- Thallium was a resource that can be extracted from Orthorhombic Crystals, which are located on the mining planet of Aguerra Prime. These are used in making Heim-drive Coil, one of the longest-lasting drive coils.
- Thallium is extremely soft and malleable and can be cut with a knife at room temperature. It has a metallic luster, but it quickly tarnishes with a bluish-grey tinge that resembles lead. It may be 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 has 25 isotopes which have atomic masses that range from 184 to 210. 203Tl and 205Tl are the only stable isotopes, and 204Tl is the most stable radioisotope, with a half-life of 3.78 years. 202Tl (half life 12.23 days) can be made in a cyclotron, while 204Tl (half life 3.78 years) is made by the neutron activation of stable thallium in a nuclear reactor. 201Tl (half-life 73 hrs), decays by electron capture, emitting Hg x-rays (~ 70–80 keV), and photons of 135 and 167 keV in 10% total abundance; therefore it has good imaging characteristics without excessive patient radiation dose. It is the most popular isotope used for thallium nuclear cardiac stress tests The two main oxidation states of thallium are +1 and +3. In the oxidation state +1 most compounds closely resemble the potassium or the silver compounds (The ionic radius of thallium(I) is 1.47 Å while that of potassium is 1.33 Å and that of silver is 1.26 Å). For example the water soluble and very basic thallium(I) hydroxide reacts with carbon dioxide forming water soluble thallium carbonate this carbonate is the only water soluble heavy metal carbonate. The similarity with silver compounds is observed with the halide, oxide, and sulphide compounds. Thallium(I) bromide is a photosensitive yellow compound very similar to the silver bromide, while the black thallium(I) oxide and thallium(I) sulphide are very similar to the silver oxide and silver sulphide. The compounds with oxidation state +3 resemble the aluminium(III) compounds. They are moderately strong oxidizing agents, as illustrated by the reduction potential of +0.72 volts for Tl3+ + 3 e- → Tl(s). The thallium(III) oxide is a black solid which decomposes above 800 °C, forming the thallium(I) oxide and oxygen.
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