Its electronic configuration is 1s. Selenium isotopes are mainly used for the production of medical and industrial radioisotopes. By doing so, you will be able to access free PDFs of NCERT Solutions as well as Revision notes, Mock Tests and much more. Its electronic configuration is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4 or it can be written as [Ar] 3d10 4s2 4p4. Classified as a nonmetal, Selenium is a solid at room temperature. 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. Group Number: 16. There are several ways you can help out, whether you’re a programmer, designer, QA engineer, writer, project manager, or just willing to help. Below is the syntax of FindElement command in Selenium web driver. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Some symptoms are more severe than others, but all represent a disruption in wellness. The electron configuration for selenium is 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 4. This trace element is even involved in DNA synthesis. Selenium can also produce electricity directly from sunlight and is used in solar cells. 600-2000 messages in 60 min. ’ which means moon. Group Name: Chalcogen. It a company of type: Non-distributing corporation with 50 or fewer shareholders. WebElement elementName = driver.findElement(By.LocatorStrategy("LocatorValue")); In chemical activity and physical properties it resembles sulfur and tellurium. 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. It affects our ecosystem as well. Selenium is a member of the sulfur group of nonmetallic elements and is similar to this element in terms of its forms and compounds. Specializing in Law Firm & Private Wealth Management Industries. Symbol of the selenium element is Se. Due to its various properties sometimes, it is considered as a metalloid as well. Selenium is a non metallic chemical element, member of the group XVI of the periodic table. They can introduce new commands to the IDE or integrate with a third-party service. 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). 34 Se Selenium 78.971. Selenium dioxide is used in manganese electrolysis. In some studies to determine if selenium could aid in prostate cancer prevention, men took 100 micrograms daily. Selenium is used in various fields mainly due to its properties such as photoconductivity, semiconductor of electricity etc. As it is found in the 16th group so, it is a p – block element. Sub-shells s, p, d and f hold a maximum of two, six, 10 and 14 electrons, respectively. Selenium is a toxic element and its high concentrations are not only harmful for the environment but for human health as well. Out of seven naturally occurring isotopes, 5 are stable and two are unstable. 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. 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. Symbol of the selenium element is Se. Selenium is found as red, grey and black allotropes of it. Although its deficiency may also cause many adverse effects on health. Write your own or install one that someone else has already written. Jons Jacob Berzelius and isolated by Johann Gottlieb Gahn, 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4 or [Ar] 3d10 4s2 4p4. 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 exhibits photovoltaic action, where light is converted directly into electricity, and photoconductive … Name of family that selenium belongs to? 34 Se (Selenium) Flashcard of Selenium. It is a soft metalloid similar to sulfur, unaffected by water and soluble in alkalis and nitric acid. 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. Atomic Number: 34. High concentrations of selenium may cause reproductive failures, defects in infants. 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 is a nonmetal element with the atomic number 34. Some symptoms are more severe than others, but all represent a disruption in wellness. The date of the company's last Annual Meeting is 2017-01-15. Selenium enters the environment as selenium dioxide through combustion of coal and oils. Se-80 is used for the production of the medical radioisotope Br-80m. Offering 20% off your current IT fees. These are the main commercial uses of selenium in today’s world. Specializing in Law Firm & Private Wealth Management Industries. Selenium toxicity is often caused by over-supplementation and can impact the human body in a number of ways. Element number 34, selenium, was discovered by Swedish chemist Jons Jacob Berzelius in 1817. Thus, it is a semiconductor. Selenium deficiency may cause Kashin – beck disease, stress, low functioning of brain, white muscle disease in ruminants, dysfunction of thyroid gland etc. Selenium forms few inorganic compounds, none of which are commercially important. 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. Automated Whatsapp messaging program sends messages to multiple Whatsapp phone number using selenium. It is a nonmetal element with the atomic number 34. Selenium is a non-metal and can be compared chemically to its other non-metal counterparts found in Group … The word selenium is derived from the Greek word ‘. Selenium Group. We hope you enjoyed learning and were able to grasp the concepts. 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). It is rarely found as pure ore or in pure elemental form. 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 Sulfur is placed above selenium and tellurium is placed below selenium in the 16th group of the periodic table. Selenium is a chemical element which is placed in the 16th group and 4th period in the periodic table. Selenium is pronounced as si-LEE-nee-em. 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. 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 Pro Lite, Vedantu 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? For questions about this page, please contact Steve Gagnon. Selenium is a chemical element with symbol Se and atomic number 34. It is used in flat panel x – ray detectors. Element number 34, selenium, was discovered by Swedish chemist Jons Jacob Berzelius in 1817. For more information on how to create your own plugin or have it listed, learn more here. Due to its various properties sometimes, it is considered as a metalloid as well. This configuration is also written as [Ar] 4s 2 3d 10 4p 4, according to Dr. Anne Marie Helmenstine, a contributor to About.com. Selenium Atomic Number and Electronic Configuration, Atomic number of selenium is 34. Overexposure of selenium may cause bronchitis, asthma, vomiting, lungs dysfunction, diarrhea, abdominal pain, shortness of breath and in severe cases death. Selenium is a non-metal and can be compared chemically to its other non-metal counterparts found in Group … What's in a name? 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 code sends approx. High concentration of selenium in fishes may cause swelling of gills and blood flow within the gills. 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. Selenium is more in common with Sulfur because they are in the same group. Pro Lite, Vedantu Symbol of the selenium element is Se. It is used to make alloys. The word selenium is derived from the Greek word ‘selene’ which means moon. Sorry!, This page is not available for now to bookmark. although its key isotope is 80Se. 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 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 … 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. We aim to make a company in the country which will make each and every product in the country rather importing. It can change light energy into electrical energy. For commercial use selenium is mostly produced as a byproduct of refining of metal sulfide ores. Its 5 isotopes are stable which are. Selenium is certainly a team effort! By object in turn can be used with various locator strategies such as ID, Name, Class Name, XPATH etc. Small amount of selenium salts is necessary for proper functioning of cells in many organisms. It is used in photocells as it is a photoconductor. This is a group of company. In fact, the enzymes that convert the thyroid hormone thyroxine (T4) to triiodothyronine (T3) are selenium-dependent (Shreenath, 2019). Managed IT Services in Toronto. 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. 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. Properties of selenium: Name of Element : Selenium Symbol of Element : Se Atomic Number of Selenium : 34 Atomic Mass: 78.96 amu 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 . Selenium is an essential trace element, but its high concentrations are harmful for the environment. Phase at Room Temperature: Solid. The control group in all trials was made up of participants on placebo capsules. 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. 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. 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. It works as an antifungal agent. Arsenic is found at the left of selenium in the 4th period and 15. group. 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. The origin of the name comes from the Greek word selene meaning moon. Selenium is a chemical element that is placed in the oxygen group of the periodic table. The active treatment in all trials was selenium capsules (200 μg per day in two trials and 256 μg per day in one trial). As it is found in the 16th group so, it is a p – block element. Selenium's resistance to the flow of electricity is greatly affected by the amount of light shining on it. Originally believing the material was tellurium, Berzelius eventually realized that it was actually a previously unknown element. The brighter the light, the better selenium conducts electricity. Atomic Weight: 78.971. It shows similar properties as sulfur, tellurium, and arsenic. It is a nonmetal element with the atomic number 34. Selenium is a chemical element which is placed in the 16th group and 4 th period in the periodic table. 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. It is generally found in metal sulfide ores. It shows similar properties as sulfur, tellurium, and arsenic. Its 5 isotopes are stable which are 74Se, 76Se, 77Se, 78Se, 80Se. Managed IT Services in Toronto. Optical Properties – Selenium conducts some amount of electricity. In the past selenium used to dominate the electronics market as it is a semiconductor but presently silicon has almost replaced selenium. Below is the syntax of FindElement command in Selenium web driver. Selenium is a member of the sulfur group of nonmetallic elements and is similar to this element in terms of its forms and compounds. Selenium is a non metallic chemical element exists in several allotropic forms, although three are generally recognized. It is generally found in metal sulfide ores. It is widely used in glassmaking and pigmentation. 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 . It is rarely found as pure ore or in pure elemental form. It is a component of many enzymes such as thioredoxin reductase, deiodinase enzymes. Se-77 and Se-78 are used for the production of the therapeutic radioisotope Br-77. Selenium was discovered and isolated by Swedish Chemists Jons Jacob Berzelius and Johann Gottlieb Gahn in 1817. We hope after reading this article you will be able to solve problems based on the topic. It shows similar properties as sulfur, tellurium, and arsenic. Period Number: 4. Relative atomic weight of selenium is 78.96. If you’re interested in helping, the best way to connect with us is at the Selenium Developers Group. Thus, it is a semiconductor. 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