It is a nonmetal element with the atomic number 34. In fact, the enzymes that convert the thyroid hormone thyroxine (T4) to triiodothyronine (T3) are selenium-dependent (Shreenath, 2019). It is used to make alloys. This configuration is also written as [Ar] 4s 2 3d 10 4p 4, according to Dr. Anne Marie Helmenstine, a contributor to About.com. Vedantu academic counsellor will be calling you shortly for your Online Counselling session. In addition to its use in electrical devices, selenium is also used to make a ruby-red color in glasses and enamels, as a photographic toner and as an additive to stainless steel. Selenium is a metallic main group element, found in Group VIb of the periodic table. Selenium exhibits photovoltaic action, where light is converted directly into electricity, and photoconductive … 116. Relative atomic mass: 78.971 (8) Selenium was discovered by Jöns Jacob Berzelius (SE) in 1817. The date of the company's last Annual Meeting is 2017-01-15. It shows similar properties as sulfur, tellurium, and arsenic. In the past selenium used to dominate the electronics market as it is a semiconductor but presently silicon has almost replaced selenium. It is rarely found as pure ore or in pure elemental form. Selenium is a chemical element which is placed in the 16th group and 4 th period in the periodic table. The word selenium is derived from the Greek word ‘selene’ which means moon. It is a soft metalloid similar to sulfur, unaffected by water and soluble in alkalis and nitric acid. The brighter the light, the better selenium conducts electricity. It a company of type: Non-distributing corporation with 50 or fewer shareholders. High concentrations of selenium may cause reproductive failures, defects in infants. Relative atomic weight of selenium is 78.96. Specializing in Law Firm & Private Wealth Management Industries. Below is the syntax of FindElement command in Selenium web driver. Selenium (Se) Atomic Data for Selenium (Se) Atomic Number = 34 Atomic Weight = 78.96 Reference E95 Arsenic is found at the left of selenium in the 4th period and 15th group. Some symptoms are more severe than others, but all represent a disruption in wellness. Sub-shells s, p, d and f hold a maximum of two, six, 10 and 14 electrons, respectively. Its electronic configuration is 1s. Selenium conducts some amount of electricity. It is used in thin – film solar cells of copper indium gallium selenide. Now a days, the selenium compound (selenium sulfide) is widely used for the treatment of dandruff. Selenium is a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. Its 5 isotopes are stable which are 74Se, 76Se, 77Se, 78Se, 80Se. Selenium (Se) Atomic Data for Selenium (Se) Atomic Number = 34 Atomic Weight = 78.96 Reference E95 Arsenic is found at the left of selenium in the 4th period and 15th group. This property has made selenium useful in devices that respond to the intensity of light, such as electric eyes, photo cells, light meters for cameras and copiers. The Selenium Group Inc. is governed under the Canada Business Corporations Act - 2010-01-26. Element Classification: Non-metal. Selenium can be extended through the use of plugins. According to Pauling scale, its electronegativity is 2.55. This code sends approx. although its key isotope is 80Se. Group Number: 16. These are the main commercial uses of selenium in today’s world. They can introduce new commands to the IDE or integrate with a third-party service. WebElement elementName = driver.findElement(By.LocatorStrategy("LocatorValue")); Selenium exhibits photovoltaic action, where light is converted directly into electricity, and photoconductive … Selenium is a member of the sulfur group of nonmetallic elements and is similar to this element in terms of its forms and compounds. Atomic number of selenium is 34. We hope you enjoyed learning and were able to grasp the concepts. Pro Lite, Vedantu Its 7 isotopes are available in nature. Sulfur is placed above selenium and tellurium is placed below selenium in the 16, group of the periodic table. It is widely used in glassmaking and pigmentation. Selenium enters the environment as selenium dioxide through combustion of coal and oils. If you are looking for solutions of NCERT Textbook problems based on this topic, then log on to Vedantu website or download Vedantu Learning App. Selenium is a non-metal and can be compared chemically to its other non-metal counterparts found in Group … It is generally found in metal sulfide ores. Stop taking selenium and call your doctor at once if you have: Offering 20% off your current IT fees. Although its deficiency may also cause many adverse effects on health. Selenium is a member of the sulfur group of nonmetallic elements and is similar to this element in terms of its forms and compounds. Pro Lite, Vedantu What's in a name? Selenium is a non metallic chemical element exists in several allotropic forms, although three are generally recognized. SELENIUM GROUP LLC: DELAWARE LIMITED-LIABILITY COMPANY (LLC) WRITE REVIEW: Address: 1220 N. Market Street Suite 804 Wilmington, DE 19801: Registered Agent: Registered Agents, Ltd. Filing Date: December 21, 2007: File Number: 4478957: Contact Us About The Company Profile For Selenium Group … Symbol of the selenium element is Se. It is a nonmetal (more rarely considered a metalloid ) with properties that are intermediate between the elements above and below in the periodic table , sulfur and tellurium , and also has similarities to arsenic . It has 2 electrons in K – shell, 8 electrons in L – shell, 18 electrons in M – shell and 6 electrons in its outermost shell N. Physical and Chemical Properties of Selenium are Listed Below, It has many isotopes. It shows similar properties as sulfur, tellurium, and arsenic. Symbol of the selenium element is Se. Small amount of selenium salts is necessary for proper functioning of cells in many organisms. Selenium is an essential trace element, but its high concentrations are harmful for the environment. By object in turn can be used with various locator strategies such as ID, Name, Class Name, XPATH etc. It has been found in research that its conductivity increases in presence of light which means its photoconductivity increases as the intensity of light increases. Most people can get their RDA of selenium from food. The electron configuration for selenium is 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 4. By object in turn can be used with various locator strategies such as ID, Name, Class Name, XPATH etc. If that isn’t enough to convince you it’s worthy of having its own fan group, selenium is also crucial for reproduction and protects against infection. Melting Point: 493.65 K (220.5°C or 428.9°F) Boiling Point: 958 K (685°C or 1265°F) Density: 4.809 grams per cubic centimeter. Selenium was discovered and isolated by Swedish Chemists Jons Jacob Berzelius and Johann Gottlieb Gahn in 1817. Managed IT Services in Toronto. It is used in fluorescent quantum dot and surge protectors. Atomic Weight: 78.971. Selenium dioxide is used in manganese electrolysis. Optical Properties – Selenium conducts some amount of electricity. Selenium was discovered and isolated by Swedish Chemists Jons Jacob Berzelius and Johann Gottlieb Gahn in 1817. We aim to make a company in the country which will make each and every product in the country rather importing. Its electronic configuration is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4 or it can be written as [Ar] 3d10 4s2 4p4. Element Selenium (Se), Group 16, Atomic Number 34, p-block, Mass 78.971. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. 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. Write your own or install one that someone else has already written. It is often found in combination with metals like mercury, copper, silver or lead. Selenium: Atomic number: 34: Atomic mass [amu] 78.96: Atomic mass [pm] 120: Density at STP [g/cm3] 4.819: Number of protons: 34: Number of neutrons (typical isotopes) 74; 76; 77; 78; 80: Number of electrons: 34: Electron configuration [Ar] 3d10 4s2 4p4: Oxidation states +4,6/-2: Electron affinity [kJ/mol] 195: Electronegativity [Pauling scale] 2.55: First ionization energy [eV] 9.7524 Its 5 isotopes are stable which are. We’ll work with you to get you set up to contribute. Specializing in Law Firm & Private Wealth Management Industries. Electronic Configuration of Group 17 Elements, Electronic Configuration of the d-Block Elements, An Introduction to Atomic Number, Isotopes and Isobars, Difference Between Atomic Mass and Atomic Weight, Chemical Properties of Metals and Nonmetals, Benzene - Physical and Chemical Properties, Vedantu Although after research it has been said that all these effects of selenium deficiency are generally accompanied with deficiency of other vitamins or other diseases. Jons Jacob Berzelius and isolated by Johann Gottlieb Gahn, 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4 or [Ar] 3d10 4s2 4p4. Selenium may cause cataracts, damage to liver tissues, respiratory problems etc. There are several ways you can help out, whether you’re a programmer, designer, QA engineer, writer, project manager, or just willing to help. Selenium Se Element 34 Mass Number: 79 Atomic weight: 78.97 g/mol Atomic number (Z): 34 Electrons: 34 Protons: 34 Neutrons: 45 Period: 4 Group: 16 Block: p Estimated Crustal Abundance: 5×10-2 milligrams per kilogram, Estimated Oceanic Abundance: 2×10-4 milligrams per liter, Number of Stable Isotopes: 6 (View all isotope data). Arsenic is found at the left of selenium in the 4th period and 15th group. High concentration of selenium in fishes may cause swelling of gills and blood flow within the gills. Atomic Number: 34. It can exist in two forms; as a silvery metal or a red powder. Classified as a nonmetal, Selenium is a solid at room temperature. Selenium is pronounced as si-LEE-nee-em. Atomic Weight: 78.96. They include selenious acid (H2SeO3), selenium dichloride (SeCl2) and selenium oxychloride (SeOCl2). For questions about this page, please contact Steve Gagnon. The amount of selenium in these products will vary, but you can typically get up to 40 mcg per 1 cup serving of noodles or cereal, and about 16 mcg from 2 slices of whole grain toast. Apart from these it has many synthetic isotopes as well, although all of its synthetic isotopes are unstable in nature. Selenium's resistance to the flow of electricity is greatly affected by the amount of light shining on it. It is a component of many enzymes such as thioredoxin reductase, deiodinase enzymes. Such as in brasses selenium is used in place of lead which is more toxic than selenium. Selenium Atomic Number and Electronic Configuration, Atomic number of selenium is 34. Selenium is used in various fields mainly due to its properties such as photoconductivity, semiconductor of electricity etc. Se-77 and Se-78 are used for the production of the therapeutic radioisotope Br-77. This last form conducts electricity better in the light than in the dark and is used in photocells. Se-74 is used for the production of Se-75 which is used as a source in gamma radiography. Automated Whatsapp messaging program sends messages to multiple Whatsapp phone number using selenium. Selenium is a non metallic chemical element, member of the group XVI of the periodic table. Pro Lite, CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. This trace element is even involved in DNA synthesis. Selenium occurs in minerals such as eucairite (CuAgSe), crooksite (CuThSe) and clausthalite (PbSe), but these minerals are too rare to use as a major source of selenium. Selenium was discovered by Jöns Jacob Berzelius, a Swedish chemist, in 1817 after analyzing an impurity that was contaminating the sulfuric acid (H2SO4) being produced at a particular factory in Sweden. By doing so, you will be able to access free PDFs of NCERT Solutions as well as Revision notes, Mock Tests and much more. It shows similar properties as sulfur, tellurium, and arsenic. Selenium is more in common with Sulfur because they are in the same group. It is combined with the physical properties of elements like tellurium and sulfur. Out of seven naturally occurring isotopes, 5 are stable and two are unstable. Phase at Room Temperature: Solid. Properties of selenium: Name of Element : Selenium Symbol of Element : Se Atomic Number of Selenium : 34 Atomic Mass: 78.96 amu Sulfur is placed above selenium and tellurium is placed below selenium in the 16th group of the periodic table. Thus, it is a semiconductor. Re: [selenium-users] Using XPath wildcards in attributes in Selenium IDE: kadambari saran: 12/13/20: Not able to invoke microsoft edge canary on MAC: lucky: 12/13/20: Is it possible to run Selenium Webdriver with Custom Browser built on WKWebView? It is used in photocells as it is a photoconductor. They have the same number of valence electrons and the only elements Selenium is related to is Sulfur and Tellurium. Element number 34, selenium, was discovered by Swedish chemist Jons Jacob Berzelius in 1817. Name of family that selenium belongs to? Overexposure of selenium may cause bronchitis, asthma, vomiting, lungs dysfunction, diarrhea, abdominal pain, shortness of breath and in severe cases death. Managed IT Services in Toronto. This ends our coverage on the topic “Selenium”. What is Selenium? What's in a name? It is a nonmetal element with the atomic number 34. Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.. Long term use of high selenium doses can lead to dangerous side effects. Here are a number of plugins created and maintained by third parties. It works as an antifungal agent. Properties: Selenium has an atomic radius of 117 pm, a melting point of 220.5°C, boiling point of 685°C, with oxidation states of 6, 4, and -2. Symbol of the selenium element is Se. It shows similar properties as sulfur, tellurium, and arsenic. In chemical activity and physical properties it resembles sulfur and tellurium. Selenium-75 is used in industrial radiology as a gamma source. 34 Se (Selenium) Flashcard of Selenium. 311 likes. It is used in flat panel x – ray detectors. 628 Hofstadter Road, Suite 6Newport News, VA 23606, Thomas Jefferson National Accelerator Facility is managed by, Jefferson Science Associates, LLC for the U.S. Department of Energy. It has many isotopes. There are five sub-shells, but only four of them are used by naturally occurring elements: s, p, d and f. Each sub-shell accommodates a certain number of electrons. Selenium (Se) is in period 4 and group 16 (VI) so it has 6 electrons in it's outer energy level which is energy level n = 4. Selenium is a chemical element that is placed in the oxygen group of the periodic table. In chemical activity and physical properties it resembles sulfur and tellurium. Group Name: Chalcogen. It can change light energy into electrical energy. It is generally found in metal sulfide ores. Se. Selenium side effects. Selenium is also a semiconductor and is used in some types of solid-state electronics as well as in rectifiers, devices which convert alternating current electricity into direct current electricity. Platforms Supported by Selenium + Browsers - Browsers. Selenium is also a photoconductor. Symbol of the selenium element is Se. 34 Se Selenium 78.971. It is used in copper alloys as well. Group Name: Chalcogen. It is a nonmetal element with the atomic number 34. Selenium is found as red, grey and black allotropes of it. Selenium burns in air and is uneffected by water, but dissolve… Selenium is a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. Selenium toxicity is often caused by over-supplementation and can impact the human body in a number of ways. Due to its various properties sometimes, it is considered as a metalloid as well. ’ which means moon. Selenium is a chemical element with symbol Se and atomic number 34. Selenium forms few inorganic compounds, none of which are commercially important. Selenium is a chemical element with the symbol Se and atomic number 34. Selenium is a toxic element and its high concentrations are not only harmful for the environment but for human health as well. The international Lake Koocanusa Monitoring and Research Working Group started studying selenium contamination six years ago after Montana Fish, Wildlife & Parks found selenium levels were increasing in seven species of fish in the lake between 2008 and 2013. Element number 34, selenium, was discovered by Swedish chemist Jons Jacob Berzelius in 1817. It is a nonmetal element with the atomic number 34. It affects our ecosystem as well. In some studies to determine if selenium could aid in prostate cancer prevention, men took 100 micrograms daily. The chalcogens (/ ˈ k æ l k ə dʒ ɪ n z /) are the chemical elements in group 16 of the periodic table.This group is also known as the oxygen family.It consists of the elements oxygen (O), sulfur (S), selenium (Se), tellurium (Te), and the radioactive element polonium (Po). Se-80 is used for the production of the medical radioisotope Br-80m. For commercial use selenium is mostly produced as a byproduct of refining of metal sulfide ores. As it is found in the 16th group so, it is a p – block element. WebElement elementName = driver.findElement(By.LocatorStrategy("LocatorValue")); We hope after reading this article you will be able to solve problems based on the topic. Selenium is also a photoconductor. Selenium is a chemical element which is placed in the 16th group and 4, period in the periodic table. Few of its uses are listed below –. Sorry!, This page is not available for now to bookmark. Selenium is a chemical element which is placed in the 16th group and 4th period in the periodic table. Today, most selenium is obtained as a byproduct of refining copper. Melting Point: 493.65 K (220.5°C or 428.9°F), Density: 4.809 grams per cubic centimeter. In selenium, the first energy level has two electrons in sub-shell s. Say what? Selenium can also produce electricity directly from sunlight and is used in solar cells. Selenium is certainly a team effort! As it is found in the 16th group so, it is a p – block element. The word selenium is derived from the Greek word ‘. For commercial use selenium is mostly produced as a byproduct of refining of metal sulfide ores. If you’re interested in helping, the best way to connect with us is at the Selenium Developers Group. Below is the syntax of FindElement command in Selenium web driver. The amount of selenium in these products will vary, but you can typically get up to 40 mcg per 1 cup serving of noodles or cereal, and about 16 mcg from 2 slices of whole grain toast. It has 2 electrons in K – shell, 8 electrons in L – shell, 18 electrons in M – shell and 6 electrons in its outermost shell N. It is found as solid at 20 ℃ temperature. It can change light energy into electrical energy. Selenium deficiency may cause Kashin – beck disease, stress, low functioning of brain, white muscle disease in ruminants, dysfunction of thyroid gland etc. Selenium Group. It has been found in research that its conductivity increases in presence of light which means its photoconductivity increases as the intensity of light increases. Element Name: Selenium. Group Number: 16. Organoselenium compounds are used in vulcanization of rubber. Due to its various properties sometimes, it is considered as a metalloid as well. Properties: Selenium has an atomic radius of 117 pm, a melting point of 220.5°C, boiling point of 685°C, with oxidation states of 6, 4, and -2. The chemically uncharacterized synthetic element livermorium (Lv) is predicted to be a chalcogen as well. Selenium IDE can be extended through the use of plugins. Arsenic is found at the left of selenium in the 4th period and 15. group. Selenium isotopes are mainly used for the production of medical and industrial radioisotopes. The control group in all trials was made up of participants on placebo capsules. 600-2000 messages in 60 min. From the Greek word for the moon, selene. The origin of the name comes from the Greek word selene meaning moon. Thus, it is a semiconductor. This is a group of company. Selenium is a non-metal and can be compared chemically to its other non-metal counterparts found in Group … A relationship between the first three members of the group was recognized as early as Selenium is a chemical element which is placed in the 16th group and 4th period in the periodic table. . Some symptoms are more severe than others, but all represent a disruption in wellness. It is rarely found as pure ore or in pure elemental form. Generally required or necessary amounts of selenium is consumed by animals and humans through food, but more amount of selenium is consumed by them through its accumulation in the environment. In one investigation, 10 groups of selenium-replete subjects were randomly assigned to receive a placebo or either 200 or 600 mcg/day selenium as selenomethionine, sodium selenite, or high-selenium yeast (in which an estimated 75% of selenium was in the form of selenomethionine) for 16 weeks . Oxygen group element, any of the six chemical elements making up Group 16 (VIa) of the periodic classification—namely, oxygen (O), sulfur (S), selenium (Se), tellurium (Te), polonium (Po), and livermorium (Lv). The number of participants included in the trials ranged from 40–70 and the trials lasted from three to six months. For more information on how to create your own plugin or have it listed, learn more here. Originally believing the material was tellurium, Berzelius eventually realized that it was actually a previously unknown element. Offering 20% off your current IT fees. 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