If you’re interested in helping, the best way to connect with us is at the Selenium Developers Group. Selenium is more in common with Sulfur because they are in the same group. Relative atomic mass: 78.971 (8) Selenium was discovered by Jöns Jacob Berzelius (SE) in 1817. Out of seven naturally occurring isotopes, 5 are stable and two are unstable. Selenium is a non-metal and can be compared chemically to its other non-metal counterparts found in Group … From the Greek word for the moon, selene. Relative atomic weight of selenium is 78.96. What's in a name? What is Selenium? Selenium deficiency may cause Kashin – beck disease, stress, low functioning of brain, white muscle disease in ruminants, dysfunction of thyroid gland etc. It can exist in two forms; as a silvery metal or a red powder. By object in turn can be used with various locator strategies such as ID, Name, Class Name, XPATH etc. Specializing in Law Firm & Private Wealth Management Industries. 600-2000 messages in 60 min. Se-80 is used for the production of the medical radioisotope Br-80m. Now a days, the selenium compound (selenium sulfide) is widely used for the treatment of dandruff. Selenium was discovered and isolated by Swedish Chemists Jons Jacob Berzelius and Johann Gottlieb Gahn in 1817. Selenium Atomic Number and Electronic Configuration, Atomic number of selenium is 34. This trace element is even involved in DNA synthesis. Selenium is a non-metal and can be compared chemically to its other non-metal counterparts found in Group … Its electronic configuration is 1s. 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. It shows similar properties as sulfur, tellurium, and arsenic. Arsenic is found at the left of selenium in the 4th period and 15th group. Sorry!, This page is not available for now to bookmark. We hope after reading this article you will be able to solve problems based on the topic. Most people can get their RDA of selenium from food. 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. High concentration of selenium in fishes may cause swelling of gills and blood flow within the gills. 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 is a chemical element which is placed in the 16th group and 4, period in the periodic table. Selenium is also a photoconductor. In the past selenium used to dominate the electronics market as it is a semiconductor but presently silicon has almost replaced selenium. 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. Below is the syntax of FindElement command in Selenium web driver. For questions about this page, please contact Steve Gagnon. They can introduce new commands to the IDE or integrate with a third-party service. For commercial use selenium is mostly produced as a byproduct of refining of metal sulfide ores. Specializing in Law Firm & Private Wealth Management Industries. Sulfur is placed above selenium and tellurium is placed below selenium in the 16th group of the periodic table. 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. The brighter the light, the better selenium conducts electricity. Atomic Number: 34. Selenium-75 is used in industrial radiology as a gamma source. Automated Whatsapp messaging program sends messages to multiple Whatsapp phone number using selenium. The chemically uncharacterized synthetic element livermorium (Lv) is predicted to be a chalcogen as well. Element Selenium (Se), Group 16, Atomic Number 34, p-block, Mass 78.971. Pro Lite, CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. 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. Its electronic configuration is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4 or it can be written as [Ar] 3d10 4s2 4p4. It is used in fluorescent quantum dot and surge protectors. 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. 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 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. It is used in flat panel x – ray detectors. Selenium is a toxic element and its high concentrations are not only harmful for the environment but for human health as well. 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. 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. Sulfur is placed above selenium and tellurium is placed below selenium in the 16, group of the periodic table. Selenium is used in various fields mainly due to its properties such as photoconductivity, semiconductor of electricity etc. It is used in copper alloys as well. Element number 34, selenium, was discovered by Swedish chemist Jons Jacob Berzelius in 1817. Selenium is a metallic main group element, found in Group VIb of the periodic table. Selenium can be extended through the use of plugins. It is a soft metalloid similar to sulfur, unaffected by water and soluble in alkalis and nitric acid. Element Name: Selenium. It is rarely found as pure ore or in pure elemental form. Selenium burns in air and is uneffected by water, but dissolve… Selenium is a member of the sulfur group of nonmetallic elements and is similar to this element in terms of its forms and compounds. Offering 20% off your current IT fees. These are the main commercial uses of selenium in today’s world. This ends our coverage on the topic “Selenium”. In chemical activity and physical properties it resembles sulfur and tellurium. 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 It is generally found in metal sulfide ores. The number of participants included in the trials ranged from 40–70 and the trials lasted from three to six months. 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). Jons Jacob Berzelius and isolated by Johann Gottlieb Gahn, 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4 or [Ar] 3d10 4s2 4p4. For more information on how to create your own plugin or have it listed, learn more here. Selenium IDE can be extended through the use of plugins. The Selenium Group Inc. is governed under the Canada Business Corporations Act - 2010-01-26. Managed IT Services in Toronto. This is a group of company. Se-77 and Se-78 are used for the production of the therapeutic radioisotope Br-77. Selenium Group. 34 Se (Selenium) Flashcard of Selenium. In fact, the enzymes that convert the thyroid hormone thyroxine (T4) to triiodothyronine (T3) are selenium-dependent (Shreenath, 2019). Symbol of the selenium element is Se. It is a nonmetal element with the atomic number 34. It can change light energy into electrical energy. 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 can also produce electricity directly from sunlight and is used in solar cells. A relationship between the first three members of the group was recognized as early as By object in turn can be used with various locator strategies such as ID, Name, Class Name, XPATH etc. Se. It is combined with the physical properties of elements like tellurium and sulfur. Overexposure of selenium may cause bronchitis, asthma, vomiting, lungs dysfunction, diarrhea, abdominal pain, shortness of breath and in severe cases death. Some symptoms are more severe than others, but all represent a disruption in wellness. Managed IT Services in Toronto. Originally believing the material was tellurium, Berzelius eventually realized that it was actually a previously unknown element. 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. By doing so, you will be able to access free PDFs of NCERT Solutions as well as Revision notes, Mock Tests and much more. Today, most selenium is obtained as a byproduct of refining copper. In some studies to determine if selenium could aid in prostate cancer prevention, men took 100 micrograms daily. 34 Se Selenium 78.971. Due to its various properties sometimes, it is considered as a metalloid as well. It is used in photocells as it is a photoconductor. 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). Organoselenium compounds are used in vulcanization of rubber. Symbol of the selenium element is Se. In chemical activity and physical properties it resembles sulfur and tellurium. Phase at Room Temperature: Solid. 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. Properties of selenium: Name of Element : Selenium Symbol of Element : Se Atomic Number of Selenium : 34 Atomic Mass: 78.96 amu Selenium is a chemical element which is placed in the 16th group and 4 th period in the periodic table. It can change light energy into electrical energy. It is used to make alloys. 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). 116. Its 7 isotopes are available in nature. We hope you enjoyed learning and were able to grasp the concepts. It works as an antifungal agent. Classified as a nonmetal, Selenium is a solid at room temperature. 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. Vedantu academic counsellor will be calling you shortly for your Online Counselling session. The date of the company's last Annual Meeting is 2017-01-15. Element number 34, selenium, was discovered by Swedish chemist Jons Jacob Berzelius in 1817. Selenium is a chemical element with the symbol Se and atomic number 34. Element Classification: Non-metal. Selenium forms few inorganic compounds, none of which are commercially important. Group Name: Chalcogen. Stop taking selenium and call your doctor at once if you have: The active treatment in all trials was selenium capsules (200 μg per day in two trials and 256 μg per day in one trial). 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? Say what? 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 control group in all trials was made up of participants on placebo capsules. They have the same number of valence electrons and the only elements Selenium is related to is Sulfur and Tellurium. 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 It a company of type: Non-distributing corporation with 50 or fewer shareholders. Selenium conducts some amount of electricity. Offering 20% off your current IT fees. According to Pauling scale, its electronegativity is 2.55. Below is the syntax of FindElement command in Selenium web driver. 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 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. Selenium is a chemical element that is placed in the oxygen group of the periodic table. Selenium's resistance to the flow of electricity is greatly affected by the amount of light shining on it. As it is found in the 16th group so, it is a p – block element. Selenium may cause cataracts, damage to liver tissues, respiratory problems etc. Atomic number of selenium is 34. 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 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 … Thus, it is a semiconductor. WebElement elementName = driver.findElement(By.LocatorStrategy("LocatorValue")); What's in a name? Atomic Weight: 78.971. Selenium side effects. Name of family that selenium belongs to? It is used in thin – film solar cells of copper indium gallium selenide. 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. WebElement elementName = driver.findElement(By.LocatorStrategy("LocatorValue")); 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. ’ which means moon. It is widely used in glassmaking and pigmentation. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. It is a nonmetal element with the atomic number 34. Group Name: Chalcogen. This last form conducts electricity better in the light than in the dark and is used in photocells. Symbol of the selenium element is Se. Few of its uses are listed below –. It has many isotopes. They include selenious acid (H2SeO3), selenium dichloride (SeCl2) and selenium oxychloride (SeOCl2). 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. Platforms Supported by Selenium + Browsers - Browsers. Melting Point: 493.65 K (220.5°C or 428.9°F), Density: 4.809 grams per cubic centimeter. although its key isotope is 80Se. Period Number: 4. We aim to make a company in the country which will make each and every product in the country rather importing. . Selenium is a chemical element with symbol Se and atomic number 34. Selenium is an essential trace element, but its high concentrations are harmful for the environment. Due to its various properties sometimes, it is considered as a metalloid as well. It is a nonmetal element with the atomic number 34. Pro Lite, Vedantu The word selenium is derived from the Greek word ‘selene’ which means moon. 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. Selenium is a chemical element which is placed in the 16th group and 4th period in the periodic table. 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. It is generally found in metal sulfide ores.