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Topic: Alkaline earth metal


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In the News (Mon 21 Jan 19)

  
  Method of making alkaline earth metal halophosphate phosphor using metal phosphide reducing agent - Patent 5350540
Metal phosphide used as a raw material in the synthesis of alkaline earth metal halophosphate phosphor activated by antimony and manganese acts as a reducing agent to prevent oxidation of the antimony and manganese.
Synthesis of alkaline earth metal halophosphate phosphor activated by antimony and manganese requires that the activators be provided in their lowest oxidation states, that is, trivalent (3.sup.+) antimony and divalent (2.sup.+) manganese.
We have found that during the synthesis of alkaline earth halophosphate phosphor activated by antimony and manganese, the addition of a metal phosphide as a raw material will ensure that the antimony and manganese activators are available in their lowest oxidation states (that is, trivalent antimony and divalent manganese).
www.freepatentsonline.com /5350540.html   (1605 words)

  
  Alkaline earth metal Summary
The alkaline earth metals, like the alkali metals, are too reactive to be found in nature except as their compounds; the two valence electrons completing an s-subshell are readily lost, and ions with +2 charges are formed.
The alkaline earth metals are the series of elements in Group 2 (IUPAC style) of the periodic table: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba) and radium (Ra) (though radium is not always considered an alkaline earth due to its radioactivity).
The alkaline earth metals are silvery colored, soft, low-density metals, which react readily with halogens to form ionic salts, and with water, though not as rapidly as the alkali metals, to form strongly alkaline (basic) hydroxides.
www.bookrags.com /Alkaline_earth_metal   (3421 words)

  
  Metal - New World Encyclopedia Preview
More recently, chemists have recognized that the main distinguishing features of a metal are (a) the ability of its atoms to lose some of their outermost electrons to form cations, and (b) the bonding of its atoms by what are called metallic bonds.
Metals are usually thought of as being hard substances, high in density and melting point.
The alkali metals (in Group 1 of the periodic table) react quickest, followed by the alkaline earth metals (in group 2).
www.newworldencyclopedia.org /preview/Metal   (1985 words)

  
 Carbonate Or Bicarbonate - Alkaline Earth Metal Containing (mg, Ca, Sr, Or Ba) inventions
Alkaline Earth Metal Containing (mg, Ca, Sr, Or Ba) patent applications listed are from June 2005 to current and include Date, Patent Application Number, Patent Title, Patent Abstract summary and are linked to the corresponding patent application page.
The present invention relates to a composition comprising an alkaline earth metal carbonate and a substrate, where the composition has a reduced amount of grit, such as an amount less than or equal to about 0.5% by weight relative to the total weight of the composition.
A method for producing an alkaline earth metal carbonate crystal comprising allowing an alkaline earth metal ion that is present at an ion concentration of 0.5 mol/L or less and a carbonate ion to react under an alkali condition to generate an alkaline earth metal carbonate crystal having an aspect...
www.freshpatents.com /x1423430000psbc.php   (590 words)

  
 alkaline earth metal
Alkaline earth metals make up group 2 of the periodic table of elements.
In the past, chemists used the term "earth" to denote slightly soluble metal oxides.
For this reason barium, strontium, and calcium were called alkaline earth metals.
www.daviddarling.info /encyclopedia/A/alkaline_earth_metal.html   (180 words)

  
 Method for fabricating a semiconductor structure having a crystalline alkaline earth metal oxide interface with silicon ...
The present invention relates in general to a method for fabricating a semiconductor structure including a crystalline alkaline earth metal oxide interface between a silicon substrate and other oxides, and more particularly to a method for fabricating an interface including an atomic layer of an alkaline earth metal, silicon, and oxygen.
The metal applied to the surface 12 to form the interface 14 may be any metal, but in the preferred embodiment comprises an alkaline-earth-metal, such as barium (Ba) or strontium (Sr).
The interface 14 comprises metal atoms (which in the preferred embodiment are illustrated as barium atoms 30), silicon atoms 32, and oxygen atoms 34.
www.freepatentsonline.com /6224669.html   (3369 words)

  
 Dalton Transactions Articles
A second part deals with the supramolecular approach for the synthesis of low dimensional polymeric compounds based on alkaline earth metal iodides, obtained by the combination of metal ion coordination with hydrogen bonding between the cationic complexes and their anions.
A first step deals with different molecular solvated alkaline earth metal iodides which are investigated as a function of the ligand size in non-aqueous solvents.
These unique structures of ligand stabilized metal halide, hydroxide and/or alkoxide and aryloxide aggregates are of interest as potential precursors for oxide materials and as catalysts.
www.rsc.org /Publishing/Journals/DT/article.asp?doi=b611042h   (386 words)

  
 Chemistry International -- Newsmagazine for IUPAC
This volume presents solubility data of azides, cyanides, cyanates, and thiocyanates of alkali metals, alkaline earth metals, and ammonium.
No solubility data have been found for some of the compounds of alkali metals, alkaline metals, and ammonium.
These include beryllium and magnesium azides, lithium, rubidium cesium, ammonium, and alkaline earth cyanates and cyanides, and beryllium thiocyanate.
www.iupac.org /publications/ci/2004/2603/bw4_hala.html   (146 words)

  
 alkaline-earth metal - Definitions from Dictionary.com
any of the group of bivalent metals including barium, radium, strontium, calcium, and, usually, magnesium, the hydroxides of which are alkalis but less soluble than those of the alkali metals.
any of the bivalent metals of group II of the periodic table (calcium or strontium or barium or magnesium or beryllium) [syn: alkaline earth]
Because the alkaline-earth metals have two electrons in their outer shell, they react easily with other elements and are found in nature only in compounds.
dictionary.reference.com /search?q=alkaline-earth+metal&r=66   (220 words)

  
 AS-A2 Group 1 Alkali Metal and Group 2 Alkaline Earth Metals s-block metal REVISION NOTES at Doc Brown's Chemistry ...
These outer electrons are of an s-orbital type (s sub-shell or sub-quantum level) and the chemistry of the metals, with relatively their low ionisation energies, is dominated by the loss of these s electrons to form a cation.
This is because the ionic radii increase down the group increasing charge separation between the metal cations of the lattice and the free delocalised electrons.
The middle 'blob' is the metal ion and the six outer 'blobs' are the water molecules.
www.wpbschoolhouse.btinternet.co.uk /page07/sblock.htm   (5313 words)

  
 ScienceDaily: Beryllium
A toxic bivalent element, beryllium is a steel grey, strong, light-weight yet brittle, alkaline earth metal, that is primarily used as a hardening agent in alloys (most notably beryllium copper).
Metals are sometimes described as a lattice of positive ions surrounded by a cloud of...
Calcium is a soft grey alkaline earth metal that is used as a reducing agent in the extraction of...
www.sciencedaily.com /encyclopedia/Beryllium   (1449 words)

  
 New Page 1
The alkaline earth family is the second most reactive group, and it's elements can't be found free in nature.
What differentiates group II from group I (alkali metals) is the term "earth." "Earth" was the alchemists term for the oxides of alkaline earth metals.
All of the alkaline earth metals are found in compound form with in the earth's crust.
www.carondelet.pvt.k12.ca.us /Family/Science/AEM/families33.htm   (288 words)

  
 Alkaline Earth Metals
Also, like the alkali metals, or indeed any other family on the periodic table, not all members of the alkali metal family are created equally in terms of their abundance on Earth or their usefulness to human life.
Yet another similarity the alkaline earth metals have with the alkali metals is the fact that four of the them—magnesium, calcium, strontium, and barium—were either identified or isolated in the first decade of the nineteenth century by English chemist Sir Humphry Davy (1778-1829).
One way that the alkaline earth metals are distinguished from the alkali metals is with regard to melting and boiling points—those temperatures, respectively, at which a solid metal turns into a liquid, and a liquid metal into a vapor.
www.scienceclarified.com /everyday/Real-Life-Chemistry-Vol-1/Alkaline-Earth-Metals.html   (4238 words)

  
 Alkaline Earth Metals
Alkaline Earth Metals are softer than most other metals, and react readily with water (especially when heated) but not as much as the corresponding alkali metals.
alchemy, which was used to describe metals that resisted fire -- the oxides of the alkaline earth metals are not affected by fire.
The metal is widely distributed in the environment in a number of minerals and a significant amount is found in sea water.
borntoexplore.org /chemistry/alkaline_earth_metals.htm   (1289 words)

  
 The Effect of Alkaline Earth Metal on the Cesium Loading of Ionsiv(R) IE-910 and IE-911
Calcium exhibited the highest solubility of the alkaline earth metals in SRS simulants.
Alkaline earth metals may compete with cesium for the available sites on the sorbent, thereby detracting from performance.
This work focused on the solubility of alkaline earth metals (i.e., magnesium, calcium, and barium) in SRS simulants and possible effects on cesium loading on crystalline silicotitanates (IE-910 and IE-911).
sti.srs.gov /fulltext/tr2000406/tr2000406.html   (2315 words)

  
 General Chemistry Online: Glossary: The periodic table
The Group 2 elements, beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra) form alkaline oxides and hydroxides and are called "alkaline earth metals".
As a consequence, sixth period transition metals are about the same size as their fifth period counterparts.
A metal is a substance that conducts heat and electricity, is shiny and reflects many colors of light, and can be hammered into sheets or drawn into wire.
antoine.frostburg.edu /chem/senese/101/periodic/glossary.shtml   (597 words)

  
 Determination of alkali metals by IC - Metrohm
Alkali metals and alkaline earth metals, antioxidants and anions such as chloride and sulfate can be determined by ion chromatography in order to check fulfillment of the requirements of DIN EN 14 214, DIN V 51 605 and ASTM D 4806 and therefore prevent motor damage.
After esterification and subsequent treatment, alkali metals and alkaline earth metals may be present in biofuel as unwanted residues.
Standard DIN EN 14 214 permits a cumulative concentration of 5 mg/kg for both the alkali metals sodium and potassium and also for the alkaline earth metals magnesium and calcium.
www.biofuel-analysis.com /method/ic-alkali-metal.html   (275 words)

  
 Alkaline - ALKALINE TRIO lyrics
The alkaline earth elements are metallic elements found in the second group of the periodic All alkaline earth elements have an oxidation number of +2,
Alkaline Trio have posted an update as they continue to write for their next album, and work on other projects.
Alkaline battery technology was introduced in the 1950s, and it quickly became a major part of everyday life.
xn--hjt353k.com /cltl/alkaline.html   (1132 words)

  
 Glow in the Dark Phosphorescent Technologies
May be improperly referred to as Strontium Aluminate, Silicate Aluminate, or Alkaline Earth Aluminate.
Products are created by taking Alkaline Earth Metal Aluminate pigments and adding an opaque fluorescent pigment to provide visibility in a lit room.
Products are created by coating Alkaline Earth Metal Aluminate pigments with a sealer to protect them from water.
glowinc.com /glow-in-the-dark/glow-in-the-dark-technologies.aspx   (379 words)

  
 The Periodic Table of the Elements - Formation Inc. - The Information Corporation
The general effect is known as the Metal - Insulator Transition, and already is quite apparent in the Periodic Table of the Elements.
Hydrocarbons and Hydrocarbon Combustion, are widely exploited by total idiots, and the inevitable results are Environmental Pollution, Ecological Degradation, Global Warming, Global Sea Level Rise, and the inevitable use of herbicides, pesticides, explosives, landmines, bullets, bombs, and the inevitable resulting War, Death and Extinction.
While alkali metals themselves are not superconducting, expanded and intercalated alkali metals very often do display superconducting properties.
www.lifeform.org /elements.htm   (1729 words)

  
 Foldable polyolefin films Number:7,211,620 from the United States Patent and Trademark Office (PTO) owispatent The ...
The polyolefin composition of claim 2 wherein the alkali or alkaline earth metal carbonate is calcium carbonate and is employed in a concentration of 8.5 to 10.9 weight %.
The polyolefin composition of claim 1, comprising: (A) 47.0 to 47.5% of the high density polyethylene; (B) 38.0 to 38.5% of the linear low density polyethylene; (C) 2.5 to 2.7% of the magnesium silicate; and (D) 11.5 to 12.0% of the alkali or alkaline earth carbonate.
The film of claim 12, comprising: (A) 47.0 to 47.5% of the high density polyethylene; (B) 38.0 to 38.5% of the linear low density polyethylene; (C) 2.5 to 2.7% of the magnesium silicate; and (D) 11.5 to 12.0% of the alkali or alkaline earth carbonate.
www.linkgrinder.com /Patents/Foldable_polyol_7211620.html   (4206 words)

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