what does selenite means?
401242
It is one form of gypsum.
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EDTA stands for ethylenediaminetetraacetic acid.  It has a very strong affinity for calcium ions in aqueous solutions.  When blood is drawn into a tube containing EDTA, calcium ions in the blood are almost irreversibly bound to the molecules of EDTA.  Calcium ions are a critical component in the biochemical cascade that results in blood clotting.  The EDTA makes the calcium ions unavailable, hence the blood will not clot.\n\nEDTA and related chemicals are known as chelating agents (the term is derived from the Greek word for "claw") because of their high affinity particularly for metals such as copper and lead.  EDTA is sometimes administered intravenously in cases of acute lead or mercury poisoning; the metal binds strongly to the molecules of EDTA, and the EDTA-metal complexes are excreted via the kidneys.  Such treatment begun soon after exposure to lead may prevent nervous system damage and minimize deposition of lead in the bones, where it is stored and slowly released over long periods of time if not gotten rid of.
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what about it?  You have it spelled wrong if you are asking about SULfide.\n\nMercury Sulfide is a chemical compound composed of the elements Mercury and Sulfur. It is represented by the chemical symbol HgS.\n\nMercury Sulfide occurs in two forms, most easily characterized by their color:\n\nThe red ore Cinnabar is the form in which mercury is most commonly found in nature. The pigment vermilion can be extracted from it. \nThe black ore is less common. It is used in pigments. \nThe CAS registry number is [[1344-48-5][1]].\n\nHgS is toxic due to the mercury content.
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zinnwaldite - a mica containing iron and lithium\natomic number 3, Li, lithium - a soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals\nisinglass, mica - any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity
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Selenium is an element, with symbol Se.  Atomic number 34, atomic mass 79.  In neutral state, has the electronic structure 1s2,2s2,2p6,3s2,3p6,4s2,3d10,4p4.  Can form both covalent compounds, where it can be either the central atom or not, or can ionize, usually to the -2 state, to form salts.
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Selenium exists in several allotropic forms; red selenium is monoclinic and contains Se8 rings. It has a melting point of 180C and a relative density of 4.45. The grey (metallic) form of selenium is formed when other varieties are heated to 200C; this has a melting point of 220C and a relative density of 4.80. Selenium is widely distributed, mainly as the selenides of heavy metals, but only has an abundance of 0.05 ppm in the earth's crust. The metal burns in air and is unaffected by water. It is soluble in alkalis and concentrated nitric acid. \n\nThe electrical properties of selenium are of particular interest as it is both photovoltaic (i.e. it becomes an electrical conductor when exposed to light or ultra violet radiation) and photoconductive (i.e. the electrical conductivity increases with increasing illumination). These properties mean that selenium has applications in the electronics industry (e.g. in the manufacture of photoelectric cells and solar cells). Selenium is used in the ceramics and glass industries (in the latter the element being used as a decoloriser and also in the manufacture of red glasses and enamels). Selenium is an important trace element for humans, the average body containing approximately 14 mg.
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The origin of the name Telluride is said to be derived from the word "tellurium," a rare element that was found in the mining ore of the region.
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Diorite (IPA: /ˈdʌɪərʌɪt/) is a grey to dark grey intermediate intrusive igneous rock composed principally of plagioclase feldspar (typically andesine), hornblende, and/or pyroxene. It can also be black or bluish-grey, and frequently has a greenish cast. Varieties deficient in hornblende and other dark minerals are called leucodiorite. It is often described as "salt and pepper" when composed largely of light-colored minerals randomly interspersed with dark minerals. When olivine and more iron-rich augite are present, the rock grades into ferrodiorite, which is transitional to gabbro. The presence of quartz makes the rock type quartz-diorite or tonalite, and if orthoclase (potassium feldspar) is present the rock type grades into granodiorite.
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Magnetite or AKA 'lodestone' - an iron containing mineral that is slightly magnetic. The orientation of the iron in the mineral is lined up much like we think of normal man-made magnets. This allows it to be attracted to earth's magnetic field.
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Elements-A substance composed of atoms having an identical number of protons in each nucleus. Elements cannot be reduced to simpler substances by normal chemical means. \n\nCompounds-A pure, macroscopically homogeneous substance consisting of atoms or ions of two or more different elements in definite proportions that cannot be separated by physical means. A compound usually has properties unlike those of its constituent elements. \n\nMixtures-A composition of two or more substances that are not chemically combined with each other and are capable of being separated. \n\nHope this helped
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it means there are two of that particular substance present in the compound. Ca is sometimes written as Ca++ when it is by itself to represent that it has 2 positive charges.  (OH) is sometimes written as (OH)- because it has a single negative charge.  for a compound to be electrically neutral you need 2 (OH) to balance 1 Ca.  that means you have 2 Oxygen, 2 Hydrogen and 1 Ca atoms for a total of 5.
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Its a very inert, extremely low density element which is low on the periodic table and gaseous at common atmospheric temperature and pressure. And when you breath it in it makes you talk funny. That last one is most important.
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it means it has hydrogen and carbon and oxygen in it.\npossibly H2CO3 in composition (or similar)
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Calcium is the chemical element in the periodic table that has the symbol Ca and atomic number 20. Calcium is a soft grey alkaline earth metal that is used as a reducing agent in the extraction of thorium, zirconium and uranium. Calcium is also the fifth most abundant element in the Earth's crust. It is essential for living organisms, particularly in cell physiology, and is the most common metal in many animals.\n\nIT MAKES YOUR BONES STRONGER - and prevents osteoporosis
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Selenium element is located in Group 6A of the periodic table. This in dicates that it has 6 electron in its valence or outermost shell. The Lewis dot structure of Selenium shoulde be written with Se surrounded by six dots. These six dots don't have to be an all four sides but if you do then that is the conventional way of doing it.
331993
I am pretty sure that it means that the element or compound is in its crystal form
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An anion has many free electrons. \nAnion means a negatively charged Ion. \nAlso \na metal piece or wire has many free electrons on it.