Selenium – Atomic Radius – Se
9 rows · Selenium is a chemical element with symbol Se and atomic number Classified as a nonmetal. Chemical symbol for Selenium is Se. Chemical element Selenium has atomic number A chemical symbol is a notation of one or two letters representing a chemical element.
Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. The chemical symbol for Hydrogen is H. With a how to hack money from atm without card atomic weight of circa 1. Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic what does pluripotent stem cell mean. The chemical symbol for Helium is He.
It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. Its boiling point is the lowest among all the elements.
Lithium chwmical a chemical element with atomic number 3 which means there are 3 protons and 3 electrons in the atomic structure. The chemical symbol for Lithium is Li. It is a soft, silvery-white alkali metal. Under standard conditions, it is the lightest metal and the lightest solid element. Like all alkali metals, lithium is highly reactive and flammable, and is stored in mineral oil.
Beryllium is a chemical element with atomic number 4 which means there are 4 protons and what is the bright planet near the moon electrons in the atomic structure. The chemical symbol for Beryllium is Be. Beryllium is a hard, grayish metal naturally found in mineral rocks, coal, soil, and volcanic dust.
The commercial use of beryllium requires the use of appropriate dust control equipment and industrial controls at all times because of the toxicity of inhaled beryllium-containing dusts that can cause a chronic life-threatening allergic disease in some people called berylliosis. Boron is a chemical element with atomic number 5 which means forr are 5 protons and 5 electrons in the atomic structure.
The chemical symbol for Boron is B. Significant concentrations of boron occur ths the Earth in compounds known as the borate minerals. There are over teh borate minerals, but the most common are: borax, kernite, ulexite etc. Natural boron consists primarily of two stable isotopes, 11B In nuclear industry boron is commonly used as a neutron absorber due to the high neutron cross-section of isotope 10B. Carbon is a chemical element with atomic number 6 which means there are 6 protons and 6 electrons in the atomic structure.
The chemical symbol for How to make an afghan with tunisian crochet is C. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. Carbon is one of the few elements known since antiquity. Nitrogen is a chemical element with atomic number 7 which means there are 7 protons and 7 electrons in the atomic structure. The chemical symbol for Nitrogen is N.
Liquid nitrogen made by distilling liquid selenum boils at Oxygen is a chemical element with atomic number 8 which means there are 8 protons and 8 electrons in the atomic structure. The chemical symbol for Oxygen is O.
Oxygen is smybol colourless, odourless what is the chemical symbol for selenium gas, the chemical element of atomic whzt 8 and the life-supporting component of the air. It is a member of the chalcogen group on the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds.
By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. Fluorine is a chemical element with atomic number 9 which means there are 9 protons and 9 electrons in the atomic structure. The chemical symbol for Fluorine is F. Fluorine is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. As the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.
Neon is a chemical element with atomic number 10 which means there are 10 protons and 10 electrons in chemial atomic structure. The chemical symbol for Neon is Ne. Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air. Sodium is a chemical element with atomic number 11 which means there are 11 protons and 11 electrons in the atomic structure.
The chemical symbol for Sodium is Na. Sodium is a soft, silvery-white, highly reactive metal. Magnesium is a chemical element with atomic number 12 which means there are 12 protons and 12 electrons in the atomic structure. The chemical symbol for Magnesium is Mg. Magnesium is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column group 2, or alkaline earth metals of the periodic table: all group 2 elements have cchemical same electron configuration in the outer electron shell and a similar crystal structure.
Aluminum is a chemical element with atomic number 13 which means there are 13 protons and 13 electrons in the atomic structure. The chemical symbol for Aluminum is Al. Aluminium is a how to do carbon dating, soft, nonmagnetic, ductile metal in the boron group.
Silicon is a chemical element with atomic number 14 which means there are 14 protons and 14 electrons in the atomic structure. The chemical symbol for Silicon is Si.
Silicon is a hard and brittle crystalline solid with a blue-grey metallic lustre, it is a tetravalent metalloid and semiconductor. Phosphorus is a chemkcal element with atomic number 15 which means there are 15 protons and 15 electrons in the atomic structure. The chemical symbol for Phosphorus is P. As an element, phosphorus exists in two major forms—white phosphorus and red phosphorus—but because it is highly reactive, phosphorus is never found as a free element on Earth. Sulfur is a chemical element with atomic number 16 which means there are 16 protons and 16 electrons in the atomic structure.
The chemical symbol for Sulfur is S. Sulfur is abundant, multivalent, and nonmetallic. Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula S8.
Elemental sulfur is a bright yellow crystalline solid at room temperature. Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, and the noble gases. Chlorine is a chemical element with atomic number 17 which means there are 17 protons and 17 electrons in the atomic structure.
The chemical symbol for Chlorine is Cl. Chlorine is a yellow-green gas at room temperature. It is an extremely reactive element and a strong oxidising agent: among the elements, it has the highest electron affinity and the third-highest electronegativity, behind only oxygen and fluorine. Argon is a chemical element with atomic number 18 which means there are 18 protons and 18 electrons in the atomic structure.
The chemical symbol for Argon is Ar. Argon is mostly used as an inert shielding gas in welding and other high-temperature industrial processes where ordinarily unreactive substances become reactive; for example, an argon atmosphere is used in graphite electric furnaces to prevent the graphite from burning.
Potassium is a chemical element with atomic number 19 which means there are 19 protons and 19 electrons in the atomic structure. The chemical symbol for Potassium is K. Potassium was what is the chemical symbol for selenium isolated from potash, the ashes of plants, from which its name derives. In the periodic table, potassium wha one of the alkali metals.
All of the alkali metals have a single valence electron in the outer foe shell, which is easily removed to create an ion with a positive charge selfnium a cation, which combines with anions to form salts.
Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. Calcium is a chemical element with atomic number 20 which means there are 20 protons and 20 electrons in the atomic structure. The chemical symbol for Calcium is Ca. Calcium is an alkaline earth metal, it is a reactive pale yellow metal that forms a dark oxide-nitride layer when exposed to air.
Its physical and chemical properties are most similar to its heavier homologues strontium and barium. Scandium is a chemical element with atomic number 21 which means there are 21 protons and 21 electrons in ehat atomic structure. The chemical symbol for Scandium is Sc. What does chameleon lady mean is a silvery-white metallic d-block element, it has historically been sometimes classified as a rare-earth element, together with yttrium and the lanthanides.
Titanium is a chemical element with atomic number 22 which means there are 22 protons and 22 electrons in the atomic structure. The chemical symbol for Titanium is Iss. Titanium is a lustrous transition metal with a silver color, low density, and high strength. Titanium sleenium resistant to corrosion in sea water, aqua regia, and chlorine. Titanium can be used in surface condensers. These condensers use tubes that are usually made of stainless steel, copper alloys, or titanium depending on several selection criteria such as thermal conductivity or corrosion resistance.
Titanium condenser tubes are usually the best technical choice, however titanium is very expensive material. Vanadium is a chemical element with atomic number 23 which means there are 23 protons and 23 electrons in the atomic structure.
The chemical symbol for Vanadium is V. Vanadium is a hard, silvery grey, ductile, and malleable transition metal. The elemental metal is rarely found in nature, but once isolated artificially, the formation of an oxide layer passivation stabilizes the free metal somewhat against further oxidation.
Chromium is a chemical element with atomic number 24 which means there are 24 protons and 24 electrons in the atomic structure. The chemical symbol for Chromium is Cr. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. A major development was the discovery that steel could be made highly resistant to corrosion and discoloration by adding metallic chromium to form stainless steel.
Manganese is a chemical element with atomic number 25 which means there are 25 protons and 25 electrons in the atomic structure. The chemical symbol for Manganese is Mn.
Chemical Symbol for Selenium
7 rows · Selenium | Se | CID - structure, chemical names, physical and chemical properties. 7 rows · Selenium is a chemical element with atomic number 34 which means there are 34 protons and Selenium Please visit the Selenium element page for information specific to the chemical element of the periodic table.
Selenium is a non metallic chemical element, member of the group XVI of the periodic table. In chemical activity and physical properties it resembles sulfur and tellurium. Selenium appearsin a number of allotropic forms: the most popular are a red amorphous powder, a red crystalline material, and a gray crystalline metallike form called metallic selenium.
This last form conducts electricity better in the light than in the dark and is used in photocells. Selenium burns in air and is uneffected by water, but dissolves in concentrated nitric acid and alkalis.
Selenium has good photovoltaic and photoconductive properties, and it is used extensively in electronics, such as photocells, light meters and solar cells. The second largest use of selenium is in the glass industry: selenium is used to remove colour from glass, to give a red colour to glasses and enamels.
Selenium can also find applications in photocopying, in the toning of photographs. Its artistic use is to intensify and extend the tonal range of black and white photographic images. Other uses of selenium are in metal alloys such as the lead plates used in storage batteries and in rectifiers to convert AC current in DC current.
Selenium is used to improve the abrasion resistance in vulcanized rubbers. Some selenium compounds are added to anti-dandruff shampoos. Selenium is among the rarer elements on the surface of this planet, and is rarer than silver.
Selenium is present in the atmosphere as metyl derivatives. Global industrial production of selenium is around tonnes a year and about tonnes of selenium are recycled from industrial waste an reclaimed from old photocopiers. Selenium occurs naturally in the environment. It is released through both natural processes and human activities. In its natural form as an element selenium cannot be created or destroyed, but selenium does have the ability to change form. Selenium levels in soils and waters increase, because selenium settles from air and selenium from waste also tends to end up in the soils of disposal sites.
When selenium in soils does not react with oxygen it remains fairly immobile. Selenium that is immobile and will not dissolve in water is less of a risk for organisms. The oxygen levels in the soil and the acidity of the soil will increase mobile forms of selenium. Higher oxygen levels and increased acidity of soils is usually cause by human activities, such as industrial and agricultural processes.
When selenium is more mobile, the chances of exposure to its compounds will be greatly enhanced. Soil temperatures, moisture, concentrations of water-soluble selenium, the season of the year, organic matter content and microbial activity determine how fast selenium will move through soil. In other words, these factors determine its mobility. Agriculture cannot only increase the selenium content in soil; it can also increase selenium concentrations in surface water, as selenium is brought along in irrigation drainage water.
Humans may be exposed to selenium in several different ways. Selenium exposure takes place either through food or water , or when we come in contact with soil or air that contains high concentrations of selenium. This is not very surprising, because selenium occurs naturally in the environment extensively and it is very widespread.
The exposure to selenium mainly takes place through food, because selenium is naturally present in grains, cereals and meat. Humans need to absorb certain amounts of selenium daily, in order to maintain good health.
Food usually contains enough selenium to prevent disease caused by shortages. Selenium uptake through food may be higher than usual in many cases, because in the past many selenium-rich fertilizers have been applied on farmland. People that live near hazardous waste-sites will experience a higher exposure through soil and air.
Selenium from hazardous waste-sites and from farmland will end up in groundwater or surface water through irrigation. This phenomenon causes selenium to end up in local drinking water , so that exposure to selenium through water will be temporarily increased. People that work in metal industries, selenium-recovery industries and paint industries also tend to experience a higher selenium exposure, mainly through breathing.
Selenium is released to air through coal and oil combustion. People that eat a lot of grains that grow near industrial sites may experience a higher exposure to selenium through food. Exposure to selenium through drinking water may be increased when selenium from hazardous waste disposals ends up in water wells.
Exposure to selenium through air only comes about in the workplace usually. It can cause dizziness, fatigue and irritations of the mucous membranes. When the exposure is extremely high, collection of fluid in the lungs and bronchitis may occur. Selenium uptake through food is usually high enough to meet human needs; shortages rarely occur. When shortages occur people may experience heart and muscle problems.
When selenium uptake is too high health effects will be likely to come about. The seriousness of these effects depends upon the concentrations of selenium in the food and how often this food is eaten.
The health effects of various forms of selenium can vary from brittle hair and deformed nails, to rashes, heat, swelling of the skin and severe pains.
When selenium ends up in the eyes people experience burning, irritation and tearing. Selenium poisoning may become so severe in some cases that it can even cause death. Overexposure of selenium fumes may produce accumulation of fluid in the lungs, garlic breath, bronchitis, pneumonitis, bronchial asthma, nausea, chills, fever, headache, sore throat, shortness of breath, conjunctivitis, vomiting, abdominal pain, diarrhea and enlarged liver.
Selenium is an eye and upper respiratory irritant and a sensitizer. Overexposure may result in red staining of the nails, teeth and hair. Selenium dioxide reacts with moisture to form selenious acid, which is corrosive to the skin and eyes. Low levels of selenium can end up in soils or water through weathering of rocks. It will than be taken up by plants or end up in air when it is adsorbed on fine dust particles.
Selenium is most likely to enter the air through coal and oil combustion, as selenium dioxide. This substance will be converted into selenium acid in water or sweat. Selenium substances in air are usually broken down to selenium and water fairly quickly, so that they are not dangerous to the health of organisms. The behaviour of selenium in the environment strongly depends upon its interactions with other compounds and the environmental conditions at a certain location at a certain time.
There is evidence selenium can accumulate in the body tissues of organisms and can than be passed up through the food chain. Usually this bio magnification of selenium starts when animals eat a lot of plants that have been absorbing large amounts of selenium, prior to digestion. Due to irrigation run-off concentrations of selenium tend to be very high in aquatic organisms in many areas. When animals absorb or accumulate extremely high concentrations of selenium it can cause reproductive failure and birth defects.
Selenium in the environment Selenium is among the rarer elements on the surface of this planet, and is rarer than silver. Health effects of selenium Humans may be exposed to selenium in several different ways.