Empirical Formula (Hill Notation) Se . Atomic Mass of Selenium Atomic mass of Selenium is 78.96 u. I am trying to use SeleniumRC to test my GWT App and am trying to match elements using CSS selectors. If the formula used in calculating molar mass is the molecular formula, the … 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 In the above, the most intense ion is set to 100% since this corresponds best to the output from a mass spectrometer. What is the chemical formula for selenium... Minerals required by the body in very small... What are the dietary sources of selenium? Melting point of Selenium is 217 °C and its the boiling point is 685 °C. The mass number... Our experts can answer your tough homework and study questions. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Here are a number of plugins created and maintained by third parties. State of Selenium is Solid at standard temperature and pressure Upon heating, it … Number of protons in Selenium is 34. Chemical symbol for Selenium is Se. Five of these isotopes are stable: 74 Se, 76 Se, 77 Se, 78 Se, and 80 Se. Boiling point of Selenium in Kelvin is 958 K. Selenium melting point is 217 °C. The nucleus consists of 34 protons (red) and 46 neutrons (blue). NACRES NA.23 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. The selenium atom has a radius of 120 pm and a Van der Waals radius of 190 pm. All other trademarks and copyrights are the property of their respective owners. This chemical element can be found in two forms: a red color powder or light grey color metal. Below is the syntax of FindElement command in Selenium web driver. Atomic weight of Selenium is 78.971 u or g/mol. PubChem Substance ID 24853754. I want to count the number of enabled buttons in the following HTML. The chemical symbol for Selenium is Se. The most important use of this chemical element is in glass production. The mass number of selenium is 78.96amu. Atomic Number of Selenium is 34. From: Analytica Chimica Acta, 2013. Number of protons in Selenium is 34. Compare Selenium vs Sulfur of the Periodic Table on all their Facts, Electronic Configuration, Chemical, Physical, Atomic properties. Block: p-block. 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 Selenium - Density - Se. EC Number 231-957-4. The mass number of selenium is 78.96amu. True or false? Inspecting the periodic table, we find selenium as atomic number 34, so it has 34 protons. The chemical symbol for Selenium is Se . It is a … 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. Atomic mass of Polonium is 209 u.. It can be also added as catalyst and as electricity convertor in rectifiers. By object in turn can be used with various locator strategies such as ID, Name, Class Name, XPATH etc. 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 and symbol Se. Se must have 34 protons to be Se, An isotope or element with a mass number 30 can't be Se. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Protons and neutrons are bound together in the nucleus. Although atoms are the smallest units of matter, they are composed of even smaller subatomic particles. Mass Number of Selenium. Atomic mass of Selenium is 78.96 u. Atomic weight of Selenium is 78.971 u or g/mol. 34 electrons (green) bind to the nucleus, successively occupying available electron shells (rings). © copyright 2003-2020 Study.com. answer! Sciences, Culinary Arts and Personal 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 … Black Se is a brittle, lustrous solid that is slightly soluble in CS2. Selenium boiling point is 685 °C. 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. Chemical symbol for Selenium is Se. Relative atomic mass: 78.971 Electron configuration: [Ar] 3d 10 4s 2 4p 4. Density of Selenium is 4.819g/cm 3. 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. - Uses, Facts, Properties & Discovery, Working Scholars® Bringing Tuition-Free College to the Community. Ask Question Asked 8 … Melting point of Selenium is 217 °C and its the boiling point is 685 °C. About; Products ... How to get the number of elements found using Selenium WebDriver with Python? All rights reserved. Density of Selenium is 4.819g/cm3. Selenium can be extended through the use of plugins. So Selenium 76 has 45 neutrons. From periodic table,we see that the atomic number of selenium is 34. Therefore it has 30 nucleons in its nucleus. The nucleus is orbited by even smaller subatomic particles called 'electrons'. 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. There seems to be no available function... Stack Overflow. Selenium Selenium is a chemical element with symbol Se and atomic number 34. Atomic Mass of Polonium. See also: Mass Number. Other elements in the same block: at 0℃ and one atmosphere pressure. Melting point of Selenium in Kelvin is 453 K. Abundant value of Selenium is 0.05 mg/kg. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. 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. The mass number is the mass of one atom of an element, measured in atomic mass units (amu). Selenium (Se). The mass number is the mass of one atom of an element, measured in atomic mass units (amu). The chemical symbol for Selenium is Se. 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 (Se) Atomic Data for Selenium (Se) Atomic Number = 34 Atomic Weight = 78.96 Reference E95 Selenium is a chemical element. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images. Atomic Mass of Selenium. Selenium forms several allotropes that interconvert with temperature changes, depending somewhat on the rate of temperature change. 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. 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. Density of Selenium. Earn Transferable Credit & Get your Degree. Diagram of the nuclear composition and electron configuration of an atom of selenium-80 (atomic number: 34), the most common isotope of this element. Element Selenium (Se), Group 16, Atomic Number 34, p-block, Mass 78.971. It is an intensive property, which is mathematically defined as mass divided by volume: ρ = m/V Become a Study.com member to unlock this Classified as a nonmetal, Selenium is a solid at room temperature. Mass numbers of typical isotopes of Selenium are 74; 76; 77; 78; 80. 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]. When rapidly melted, it forms the black, vitreous form, usually sold commercially as beads. The atomic mass is the mass of an atom. Atomic Number of Selenium. 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 The density of a substance strongly depends on its atomic mass and also on the atomic number density. The structure of black selenium is irregular and complex and consists of polymeric rings with up to 1000 atoms per ring. Create your account. Selenium has a beautiful name coming after the Greek name for the Moon. WebElement elementName = driver.findElement(By.LocatorStrategy("LocatorValue")); Services, What is Selenium? Atomic Number of Polonium. 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: … Isotope abundances of selenium. MDL number MFCD00134090. Density is defined as the mass per unit volume. Atomic number: 34. What are the signs and symptoms of selenium... What are the functions of selenium in the body? Selenium powder, −100 mesh, 99.99% trace metals basis CAS Number 7782-49-2. It has 34 protons and 34 electrons and a mass number of 78.96. When prepared in chemical reactions, selenium is usually an amorphous, brick-red powder. 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: 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. I want to get an element by class name or xpath and return the number of instances. For more information on how to create your own plugin or have it listed, learn more here. Typical densities of various substances at atmospheric pressure. Platforms Supported by Selenium + Browsers - Browsers. Its chemical symbol is Se and its atomic number is 34. Molecular Weight 78.96 . If the total mass is 80, then the number of neutrons is 80-34 = 46. Se-30 has a mass number (A) of 30. Know what is Selenium, Chemical Properties of Selenium, Atomic Mass, and more at BYJU'S This is not to be confused with the relative percentage isotope abundances which totals 100% for all the naturally occurring isotopes. 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