what are lanthanides and actinides
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Lanthanides and Actinides All metals are placed at the left side of the periodic table. Around 75% of elements are metallic in nature and belong to s, d and f-blocks. The non-metals and metalloids are placed in p-block with few metals. The elements of f-block are also called as Lanthanides and Actinides.These names come from the Lanthanum and Actium after which, both series of f-block are started.ses of Lanthanides and Actinides. 1  They don’t find any use in their pure state. 2  They are used in the production of alloys of steel to improve the strength and workability of steel. 3  A well known alloy is mischmetal which is used in making magnesium based alloy (Mg mixed with 3% of mischmetal).
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Definitions &Translations Here are all the possible meanings and translations of the word la. Princeton's WordNet(0.00 / 0 votes)Rate this definition: lanthanum, La, atomic number 57(noun) a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth.
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Lanthanum Lanthanum is the first element and prototype of the lanthanide series. In the periodic table, it appears to the right of the alkaline earth metal barium and to the left of the lanthanide cerium. Lanthanum is often considered to be a group 3 element, along with its lighter congeners scandium and yttrium and its heavier congener, the radioactive actinium, although this classification is sometimes disputed.
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Extension of the periodic table Characterization and identification. Two important factors provided the key to the discovery and identification of many of the earliest-known transuranium elements. One was the actinoid concept, which stated that the transuranium elements were part of a series of elements that paralleled the earlier lanthanoid series. It was postulated (and subsequently demonstrated) that this actinoid series started at thorium and that its chemistry would be similar to that of the lanthanoids.
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TERBIUM Although the term rare earth is still used, the more proper name for terbium and its cousins is the lanthanides. The term lanthanide comes from the element lanthanum in Row 6 of the periodic table. The periodic table is a chart that shows how chemcial elements are related to one another.
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- 1 Actinium: Greek: aktinos, ray (because it glows with a blue light in the dark) 2  Antimony: Greek: anti + monos, not alone (because it was never found uncombined with another element)  Argon: Greek: argos, idle (because of its unreactivity)
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Definitions &Translations Princeton's WordNet(0.00 / 0 votes)Rate this definition: 1  lanthanum, La, atomic number 57(noun) a white soft metallic element that tarnishes readily; occurs in rare earth minerals and is usually classified as a rare earth.
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- Position of Transition Metals in the Periodic Table. The elements in the periodic table are often divided into four categories: (1) main group elements, (2) transition metals, (3) lanthanides, and (4) actinides. The main group elements include the active metals in the two columns on the extreme left of the periodic table and the metals, semimetals, and nonmetals in the six columns on the far right. The transition metals are the metallic elements that serve as a bridge, or transition, between the two sides of the table.
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- Lanthanum, which is the first element of lanthanide series, is a silvery white metal and rare-earth element. Lanthanum can be mainly found in monazite and bastnasite. Although the source of lanthanum is not rare, but the process to get pure material is very complex.
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What Are Rare Earths? There are 17 elements that are considered to be rare earth elements—15 elements in the lanthanide series and two additional elements that share similar chemical properties. They are listed below in order of atomic number (Z): Scandium or Sc (21). Scandium, a silvery-white metal, is a non-lanthanide rare earth.his silver-white metal is one of the most reactive rare earth elements. It is used to make special optical glasses, including infrared absorbing glass, camera and telescope lenses, and can also be used to make steel more malleable. Other applications for lanthanum include wastewater treatment and petroleum refining.
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Lanthanum Rare-earth compounds containing lanthanum are extensively used in carbon lighting applications, especially by the motion picture industry for studio lighting and projection.
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Transition Metals - List and Properties The largest group of elements on the periodic table is the transition metals. They are found in the middle of the table, plus the two rows of elements below the main body of the periodic table (the lanthanides and actinides) are special subsets of the transition metals. The transition metals are also known as the d-block elements.
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- Oxidation States of the Transition Metals. Position of Transition Metals in the Periodic Table. The elements in the periodic table are often divided into four categories: (1) main group elements, (2) transition metals, (3) lanthanides, and (4) actinides.xidation States of the Transition Metals. Position of Transition Metals in the Periodic Table. The elements in the periodic table are often divided into four categories: (1) main group elements, (2) transition metals, (3) lanthanides, and (4) actinides.
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Rare Earth Elements Rare earth elements are a set of seventeen chemical elements in the periodic table, specifically the fifteen lanthanides plus scandium and yttrium. Scandium and yttrium are considered rare earth elements since they tend to occur in the same ore deposits as the lanthanides and exhibit similar chemical properties.
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- All of the actinides are radioactive and those above Z=92 are manmade in nuclear reactors or accelerators. The general properties of the transition elements are. 1  They are usually high melting point metals. 2  They have several oxidation states. 3  They usually form colored compounds. 4  They are often paramagnetic.
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Lanthanum It gave its name to the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table: it is also sometimes considered the first element of the 6th-period transition metals. As such, it almost always assumes the oxidation state +3. Hydrogen sponge alloys can contain lanthanum. 2  These alloys are capable of storing up to 400 times their own volume of hydrogen gas in a reversible adsorption process. 3  Heat energy is released every time they do so; therefore these alloys have possibilities in energy conservation systems.
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Lanthanides 1 Monazite sand is a source of lighter lanthanides in their trivalent phosphate form. 2  The application of Lanthanide elements as biological tracers is used to trace the effectiveness and target route of drugs in humans and animals.
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Lanthanum - La Lanthanum. Lanthanum is a soft, malleable, ductile, silver-white metal. It is chemically active, it is one of the most reactive of the rare-earth metals: it oxidizes rapidly in air and it reacts with water to form the hydroxide.
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- F-block Elements. 14 elements from atomic number 58 (Cerium) to 71(Lutetium) are called as Lanthanides and the another 14 elements from atomic number 90 (Thorium) to 103(Lawrencium) are called as Actinides.
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Lanthanum Element Facts / Chemistry Lanthanum and its compounds are considered to be moderately toxic. Characteristics: Lanthanum is a silvery-white soft metal, which can be cut with a knife. It is ductile, malleable and exposed surfaces tarnish rapidly in air forming the oxide. Lanthanum reacts with water to form lanthanum hydroxide plus hydrogen gas. Lanthanum is chemically reactive and forms compounds with carbon, nitrogen, boron, selenium, silicon, phosphorus, sulfur, and with the halogens. Lanthanum usually exists as a trivalent ion, La 3+ , in its compounds.
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What Are Rare Earths? Lanthanum or La (57). This silver-white metal is one of the most reactive rare earth elements. It is used to make special optical glasses, including infrared absorbing glass, camera and telescope lenses, and can also be used to make steel more malleable.Other applications for lanthanum include wastewater treatment and petroleum refining.candium, a silvery-white metal, is a non-lanthanide rare earth. It is used in many popular consumer products, such as televisions and fluorescent or energy-saving lamps. In industry, the primary use of scandium is to strengthen metal compounds.
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Lanthanides The other lanthanides are relatively abundant in Earth's crust. Cerium, for example, is the twenty-sixth most abundant element. Even thulium, the second rarest lanthanide after promethium, is more abundant than iodine.
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- Swedish chemist Carl Gustav Mosander discovered lanthanum during experiments on an impure sample of cerium nitrate in 1839. Like most of the rare-earth elements, lanthanum is used in small amounts to alter key properties of other materials.Lanthanum oxide is added to glass to impart increased resistance to alkalis, strength, a high refractive index and low dispersion, and can be used to make infrared-absorbing glass.wedish chemist Carl Gustav Mosander discovered lanthanum during experiments on an impure sample of cerium nitrate in 1839. Like most of the rare-earth elements, lanthanum is used in small amounts to alter key properties of other materials.
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Lanthanum Lanthanum compounds have numerous applications as catalysts, additives in glass, carbon lighting for studio lighting and projection, ignition elements in lighters and torches, electron cathodes, scintillators, GTAW electrodes, and others.
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- The word lanthanum comes from the Greek λανθανω [lanthanō] (lit. to lie hidden). Lanthanum was discovered in 1839 by Swedish chemist Carl Gustav Mosander, who partially decomposed a sample of cerium nitrate by roasting it in air and then treating the resulting oxide with dilute nitric acid.lthough it is classified as a rare earth element, lanthanum is the 28th most abundant element in the Earth's crust, being just under three times as abundant as lead. In minerals such as monazite and bastnaesite, bastnäsite lanthanum makes up over a quarter of the lanthanide. content
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Lanthanum Lanthanum is usually found in combination with cerium and other rare earth elements, and it was first found by the Swedish chemist Carl Gustav Mosander in 1839 as an impurity in cerium nitrate – hence the name lanthanum, from the Greek λανθανειν (lanthanein), meaning to lie hidden.