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rare earth element
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(chemistry) Any of a group of seventeen soft, lustrous, sometimes magnetic metals that form trivalent salts; they include the lanthanides plus yttrium, scandium, thorium and sometimes zirconium.
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any of the fifteen lanthanides plus scandium and yttrium
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Cerium, a rare-earth element discovered in 1803, was named after Ceres.
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It has the composition UO2 with about 10% of the uranium substituted by rare-earth elements.
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Cerium occurs naturally as a mixture with other rare-earth elements in its principal ores bastnaesite and monazite.
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So in 1842 the number of known rare-earth elements had reached six: yttrium, cerium, lanthanum, didymium, erbium and terbium.
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Rare earth elements can often be found, but in many areas, it’s not economically feasible to extract them due to low concentrations.
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There also exist chemically peculiar stars that show unusual abundances of certain elements in their spectrum; especially chromium and rare earth elements.
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Rare-earth elements, pnictogens, chalcogens, and halogens are not used as category names, but the latter three are valid as group (column) names.
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Scandium and yttrium are considered rare-earth elements because they tend to occur in the same ore deposits as the lanthanides and exhibit similar chemical properties.
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Period 6 is the first period to include the f-block, with the lanthanides (also known as the rare earth elements), and includes the heaviest stable elements.
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The elements in parentheses are listed in the order of their relative proportion within the mineral: lanthanum is the most common rare-earth element in monazite-(La), and so forth.
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KREEP, an acronym built from the letters K (the atomic symbol for potassium), REE (rare-earth elements) and P (for phosphorus), is a geochemical component of some lunar impact breccia and basaltic rocks.
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There has been some controversy surrounding the discovery of hafnium and the extent to which Coster and Hevesy were guided by Bohr's prediction that hafnium would be a transition metal rather than a rare earth element.
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In 1991, a Bell Labs research team transmitted solitons error-free at 2.5 gigabits over more than 14,000 kilometres, using erbium optical fibre amplifiers (spliced-in segments of optical fibre containing the rare earth element erbium).
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Initial versions of the periodic table did not distinguish rare earth elements from transition elements, helping to explain both why Mendeleev's predictions for heavier unknown elements did not fare as well as those for the lighter ones and why they are not as well known or documented.
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Very low concentrations of the heaviest lanthanides in monazite justified the term "rare" earth for these elements, with prices to match.
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Many of the elements shown in the graph are classified into (partially overlapping) categories: rock-forming elements (major elements in green field, and minor elements in light green field); rare earth elements (lanthanides, La-Lu, and Y; labeled in blue); major industrial metals (global production >~3×107 kg/year; labeled in red); precious metals (labeled in purple); the nine rarest "metals" — the six platinum group elements plus Au, Re, and Te (a metalloid) — in the yellow field.
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Adams omits the rare earths and the "radioactive elements" (i.e. the actinides) from the main body of his table and instead shows them as being "careted in only to save space" (rare earths between Ba and eka-Yt; radioactive elements between eka-Te and eka-I).
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Seaborg's actinide concept of heavy element electronic structure, predicting that the actinides form a transition series analogous to the rare earth series of lanthanide elements, is now well accepted and included in the periodic table.
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Elemental hydrogen is relatively rare on Earth, and is industrially produced from hydrocarbons such as methane.
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All other elements are either incredibly rare on earth (technetium, rhenium) or completely synthetic (bohrium).
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Rare earths are a selection of 17 elements that are actually common in Earth’s crust and are found in many areas across the world in low concentrations.
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Scandium is quite common in nature, but difficult to find because it is most prevalent in rare earth compounds, which are difficult to isolate elements from.
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They knew that such high concentrations of this rare element could come only from the earth’s core or from sources outside the earth.
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The elements, after purification from other rare-earth metals, are isolated as oxides; the oxides are converted to fluorides during reactions with hydrofluoric acid.
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There is amazing variety among the elements of our earth; some of them are rare; others are abundant.
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33 sinne gevind in 12 ms. Hulle kom uit baie bronne en word nie nagegaan nie.