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The number of electrons in each of Selenium's shells is 2, 8, 18, 6 and its electron configuration is [Ar] 3d 10 4s 2 4p 4. I want to count the number of enabled buttons in the following HTML. The nucleus is orbited by even smaller subatomic particles called 'electrons'. Its chemical symbol is Se and its atomic number is 34. Platforms Supported by Selenium + Browsers - Browsers. Five of these isotopes are stable: 74 Se, 76 Se, 77 Se, 78 Se, and 80 Se. Selenium has a beautiful name coming after the Greek name for the Moon. 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. Therefore it has 30 nucleons in its nucleus. Become a Study.com member to unlock this Selenium is a metalloid with atomic number 34 (discovered in 1817 by J. J. Berzelius) that has been demonstrated to be essential for living organisms. If the formula used in calculating molar mass is the molecular formula, the … Boiling point of Selenium in Kelvin is 958 K. Selenium melting point is 217 °C. Atomic weight of Selenium is 78.971 u or g/mol. This element is vital for living creatures and things, but just in micro doses, and in excess doses it can cause cancer or serious intoxication. Selenium (Se). From periodic table,we see that the atomic number of selenium is 34. Selenium forms several allotropes that interconvert with temperature changes, depending somewhat on the rate of temperature change. Other elements in the same block: Atomic Number of Selenium is 34. Empirical Formula (Hill Notation) Se . Name: Selenium Symbol: Se Atomic Number: 34 Atomic Mass: 78.96 amu Melting Point: 217.0 °C (490.15 K, 422.6 °F) Boiling Point: 684.9 °C (958.05005 K, 1264.8201 °F) Number of Protons/Electrons: 34 Number of Neutrons: 45 Classification: Non-metal Crystal Structure: Hexagonal Density @ 293 K: 4.79 g/cm 3 Color: gray Atomic Structure Selenium is a chemical element. The mass number of selenium is 78.96amu. The total number of neutrons in the nucleus of an atom is called the neutron number of the atom and is given the symbol N. Neutron number plus atomic number equals atomic mass number: N+Z=A. It has 34 protons and 34 electrons and a mass number of 78.96. Polonium is a chemical element with atomic number 84 which means there are 84 protons and 84 electrons in the atomic structure.The chemical symbol for Polonium is Po. Mass numbers of typical isotopes of Selenium are 74; 76; 77; 78; 80. Compare Selenium vs Sulfur of the Periodic Table on all their Facts, Electronic Configuration, Chemical, Physical, Atomic properties. Typical densities of various substances at atmospheric pressure. Selenium (Se) Atomic Data for Selenium (Se) Atomic Number = 34 Atomic Weight = 78.96 Reference E95 All other trademarks and copyrights are the property of their respective owners. Selenium (34 Se) has six natural isotopes that occur in significant quantities, along with the trace isotope 79 Se, which occurs in minute quantities in uranium ores. Our Periodic Element comparison tool allows you to compare Periodic Elements properties side by side for all 118 elements | SchoolMyKids Interactive Dynamic Periodic Table, Periodic Table Element Comparison tool, Element Property trends This chemical element can be found in two forms: a red color powder or light grey color metal. Know what is Selenium, Chemical Properties of Selenium, Atomic Mass, and more at BYJU'S Selenium powder, −100 mesh, 99.99% trace metals basis CAS Number 7782-49-2. Selenium: Atomic Number 34, Mass Number 78.96 David Tin Win Faculty of Science and Technology, Assumption University Bangkok, Thailand Abstract Selenium, a trace element, is an antioxidant and is an essential component for normal functioning of the immune system and thyroid gland. Protons and neutrons are bound together in the nucleus. Diagram of the nuclear composition and electron configuration of an atom of selenium-80 (atomic number: 34), the most common isotope of this element. The most important use of this chemical element is in glass production. Both Keshan disease and Kashin-Beck disease are... ScienceFusion Matter and Energy: Online Textbook Help, Holt McDougal Modern Chemistry: Online Textbook Help, CSET Science Subtest II Chemistry (218): Practice & Study Guide, College Chemistry: Homework Help Resource, National Entrance Screening Test (NEST): Exam Prep, SAT Subject Test Chemistry: Practice and Study Guide, UExcel General Chemistry I: Study Guide & Test Prep, Biological and Biomedical answer! It is a … The structure of black selenium is irregular and complex and consists of polymeric rings with up to 1000 atoms per ring. 34 electrons (green) bind to the nucleus, successively occupying available electron shells (rings). NACRES NA.23 Isotope abundances of selenium. Mass Number of Selenium. Below is the syntax of FindElement command in Selenium web driver. Chemical symbol for Selenium is Se. Selenium in its pure form can not be found on the surface of our planet, but it exists in some rare minerals and special muds. True or false? The mass number is the mass of one atom of an element, measured in atomic mass units (amu). Although atoms are the smallest units of matter, they are composed of even smaller subatomic particles. Atomic weight of Selenium is 78.971 u or g/mol. It is an intensive property, which is mathematically defined as mass divided by volume: ρ = m/V Melting point of Selenium in Kelvin is 453 K. Abundant value of Selenium is 0.05 mg/kg. Inspecting the periodic table, we find selenium as atomic number 34, so it has 34 protons. The nucleus consists of 34 protons (red) and 46 neutrons (blue). The mass number is the mass of one atom of an element, measured in atomic mass units (amu). Step-2: We know that the atomic number of selenium is 34.So selenium has 34 protons and 34 electrons as the charge of electrons and protons are equal but opposite in nature.The charge of proton is … Se-30 has a mass number (A) of 30. By object in turn can be used with various locator strategies such as ID, Name, Class Name, XPATH etc. Selenium boiling point is 685 °C. The chemical symbol for Selenium is Se. Selenium is an element of group VIA and period 4 of the periodic table with Atomic Number Z=34 and Mass Number A=78.96 [1]. Selenium is a chemical element with atomic number 34 and symbol Se. Here are a number of plugins created and maintained by third parties. What are the signs and symptoms of selenium... What are the functions of selenium in the body? MDL number MFCD00134090. What is the chemical formula for selenium... Minerals required by the body in very small... What are the dietary sources of selenium? This is not to be confused with the relative percentage isotope abundances which totals 100% for all the naturally occurring isotopes. Element Selenium (Se), Group 16, Atomic Number 34, p-block, Mass 78.971. Selenium - Density - Se. Earn Transferable Credit & Get your Degree. Sciences, Culinary Arts and Personal Se has a atomic number (Z) of 34, with usually around 79 nucleons (Mass number; A) , so has 34 protons and 45 neutrons, If it is not an ion Se would have 34 electrons. Atomic Mass of Selenium Atomic mass of Selenium is 78.96 u. Density of Selenium is 4.819g/cm 3. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. From: Analytica Chimica Acta, 2013. Atomic Number of Polonium. The chemical symbol for Selenium is Se . PubChem Substance ID 24853754. There seems to be no available function... Stack Overflow. If the total mass is 80, then the number of neutrons is 80-34 = 46. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. For more information on how to create your own plugin or have it listed, learn more here. Block: p-block. See also: Mass Number. The mass number... Our experts can answer your tough homework and study questions. I am trying to use SeleniumRC to test my GWT App and am trying to match elements using CSS selectors. When prepared in chemical reactions, selenium is usually an amorphous, brick-red powder. The density of a substance strongly depends on its atomic mass and also on the atomic number density. The mass number of selenium is 78.96amu. Density of Selenium. Selenium is an antioxidant... Selenium Se, is on the periodic table, but does it... Selenium is used in solar panels because it. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Atomic Number of Selenium. Number of protons in Selenium is 34. - Uses, Facts, Properties & Discovery, Working Scholars® Bringing Tuition-Free College to the Community. © copyright 2003-2020 Study.com. Atomic mass of Selenium is 78.96 u. In the above, the most intense ion is set to 100% since this corresponds best to the output from a mass spectrometer. Density is defined as the mass per unit volume. Relative atomic mass: 78.971 Electron configuration: [Ar] 3d 10 4s 2 4p 4. It can be also added as catalyst and as electricity convertor in rectifiers. All rights reserved. Atomic Mass of Selenium. at 0℃ and one atmosphere pressure. EC Number 231-957-4. State of Selenium is Solid at standard temperature and pressure WebElement elementName = driver.findElement(By.LocatorStrategy("LocatorValue")); Molecular Weight 78.96 . A simply formula is the atomic mass of selenium (rounded to the whole number) - atomic number = neutrons. Density of Selenium is 4.819g/cm3. Selenium can be extended through the use of plugins. Selenium: Symbol: Se: Atomic Number: 34: Atomic Mass: 78.96 atomic mass units Number of Protons: 34: Number of Neutrons: 45: Number of Electrons: 34: Melting Point: 217.0° C: Boiling Point: 684.9° C: Density: 4.79 grams per cubic centimeter: Normal Phase: … Atomic number: 34. Atomic Mass of Polonium. Black Se is a brittle, lustrous solid that is slightly soluble in CS2. The atomic mass is the mass of an atom. Selenium Selenium is a chemical element with symbol Se and atomic number 34. Melting point of Selenium is 217 °C and its the boiling point is 685 °C. So Selenium 76 has 45 neutrons. Classified as a nonmetal, Selenium is a solid at room temperature. Chemical symbol for Selenium is Se. Ask Question Asked 8 … Number of protons in Selenium is 34. Atomic mass of Polonium is 209 u.. The selenium atom has a radius of 120 pm and a Van der Waals radius of 190 pm. About; Products ... How to get the number of elements found using Selenium WebDriver with Python? The chemical symbol for Selenium is Se. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. I want to get an element by class name or xpath and return the number of instances. Upon heating, it … Mass Percent: Selenium: Se: 78.96: 1: 100.000% ... of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together. When rapidly melted, it forms the black, vitreous form, usually sold commercially as beads. Se must have 34 protons to be Se, An isotope or element with a mass number 30 can't be Se. Create your account. Melting point of Selenium is 217 °C and its the boiling point is 685 °C. Services, What is Selenium?

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