It explains how we use cookies (and other locally stored data technologies), how third-party cookies are used on our Website, and how you can manage your cookie options. Number of protons in Selenium is 34. If you want to get in touch with us, please do not hesitate to contact us via e-mail: The information contained in this website is for general information purposes only. It explains how we use cookies (and other locally stored data technologies), how third-party cookies are used on our Website, and how you can manage your cookie options. Find the atomic number (Z) and mass number (A). However, this assumes the atom to exhibit a spherical shape, which is only obeyed for atoms in vacuum or free space. The standard SI unit is kilograms per cubic meter (kg/m3). To find out mass number,we need to round 78.96 to a whole number.So,by rounding,we are getting mass number of selenium (Se) .The mass number of selenium (Se) is 79. The number of electrons in an electrically-neutral atom is the same as the number of protons in the nucleus. For example, 63Cu (29 protons and 34 neutrons) has a mass number of 63 and an isotopic mass in its nuclear ground state is 62.91367 u. Chemical symbol for Selenium is Se. A horizontal row in the periodic table. So, 79-34 will get you 45 neutrons. Germanium is a chemical element with atomic number 32 which means there are 32 protons in its nucleus.Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z.The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. Our Privacy Policy is a legal statement that explains what kind of information about you we collect, when you visit our Website. I am trying to use SeleniumRC to test my GWT App and am trying to match elements using CSS selectors. The chemical symbol for Selenium is Se. Much of our radiation exposure is due to radon. Members of a group typically have similar properties and electron configurations in their outer shell. For stable elements, there is usually a variety of stable isotopes. It is an intensive property, which is mathematically defined as mass divided by volume: In words, the density (ρ) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance. Calculate numbers of protons, neutrons, and electrons by using mathematical expressions (1-3): p = 11. n = 23 - 11 = 12. e = 11 - 0 = 11 4. Main purpose of this project is to help the public to learn some interesting and important information about chemical elements and many common materials. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. 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. Since atomic number represents number of protons, that will be 34. Selenium (Se). Elemental state of Selenium or as a pure ore compound rarely occurs in the Earth's crust. Atomic Number of Selenium is 34. In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all … 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. Explanation: #""^222Rn# has #Z=86#. The Cookies Statement is part of our Privacy Policy. 1) You may use almost everything for non-commercial and educational use. It is a … ›› Selenium Tetrabromide molecular weight. 96 @inproceedings{WinSeleniumA, title={Selenium : Atomic Number 34 , Mass Number 78 . edit. 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. Since 's atomic number is , has protons. One atomic mass unit is equal to 1.66 x 10-24 grams. Selenium is a chemical element with symbol Se and atomic number 34. Selenium exhibits photovoltaic action, where light is converted directly into electricity, and photoconductive … If you want to get in touch with us, please do not hesitate to contact us via e-mail: Copyright 2020 Periodic Table | All Rights Reserved |, Germanium – Periodic Table – Atomic Properties, Bromine – Periodic Table – Atomic Properties. 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 75 in Selenium 75 is the mass number and it … Glossary. 96}, author={D. T. Win} } D. T. Win; Selenium, a trace element, is an antioxidant and is an essential component for normal functioning of the immune system and thyroid gland. For other isotopes, the isotopic mass usually differs and is usually within 0.1 u of the mass number. 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. It has 34 protons and 34 electrons and a mass number of 78.96. We realize that the basics in the materials science can help people to understand many common problems. 5. 1 decade ago Selenium has atomic number of 34. this atomic number is also the number of proton. The information contained in this website is for general information purposes only. See more Selenium products. For 12C the atomic mass is exactly 12u, since the atomic mass unit is defined from it. talk. It contains seven natural isotopes, including 74 Se, 76 Se, 77 Se, 78 Se, 79 Se, 80 Se, 82 Se as well as 23 other synthetic isotopes. 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 Atomic Mass of Selenium Atomic mass of Selenium is 78.96 u. It is a micronutrient. The chemical symbol for Selenium is Se. The Standard English unit is pounds mass per cubic foot (lbm/ft3). Melting point of Selenium is 217 °C and its the boiling point is 685 °C. At room temperature this element is a very stable gas. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. Main purpose of this project is to help the public learn some interesting and important information about the peaceful uses of nuclear energy. Typical densities of various substances are at atmospheric pressure. Selenium is a chemical element with atomic number 34 which means there are 34 protons in its nucleus. The mass number is the number of particles in an atom 's nucleus. Group. The atomic mass is the mass of an atom. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. This website was founded as a non-profit project, build entirely by a group of nuclear engineers. Selenium is a chemical element with the symbol Se and atomic number 34. Feel free to ask a question, leave feedback or take a look at one of our articles. Each electron is influenced by the electric fields produced by the positive nuclear charge and the other (Z – 1) negative electrons in the atom. Chemistry Matter Mass Number. X + e– → X– + energy        Affinity = – ∆H. Density is defined as the mass per unit volume. Its chemical symbol is Se and its atomic number is 34. This website does not use any proprietary data. It is indicated by the symbol Se and the atomic number of selenium is 34. Note that, ionization energies measure the tendency of a neutral atom to resist the loss of electrons. State or as a nonmetal, Selenium is 78.971 u or g/mol part of our.... Property that describes the tendency of an atom number is the mass unit. The loss of electrons in the above, the actual atom is with... For this purposes, a dimensionless quantity the Pauling scale, symbol χ, a. 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