Therefore, there are various non-equivalent definitions of atomic radius. In other words, it can be expressed as the neutral atom’s likelihood of gaining an electron. One unified atomic mass unit is approximately the mass of one nucleon (either a single proton or neutron) and is numerically equivalent to 1 g/mol. Explanation: #""^222Rn# has #Z=86#. This website does not use any proprietary data. Take the difference of the mass number and the atomic number to get the number of neutrons. 82 Kr. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10-19 coulombs. Our Website follows all legal requirements to protect your privacy. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. It rarely occurs in its elemental state or as pure ore compounds in the Earth’s crust. Compare Selenium vs Sulfur of the Periodic Table on all their Facts, Electronic Configuration, Chemical, Physical, Atomic properties. 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. 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. Atomic weight of Selenium is 78.971 u or g/mol. There are two reasons for the difference between mass number and isotopic mass, known as the mass defect: Typical densities of various substances at atmospheric pressure. Mass Number of Selenium. Isotopes are nuclides that have the same atomic number and are therefore the same element, but differ in the number of neutrons. It must be noted, atoms lack a well-defined outer boundary. The atomic mass is the mass of an atom. The mass number is the number of particles in an atom 's nucleus. 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. Its chemical symbol is Se and its atomic number is 34. Molar mass of SeBr4 = 398.576 g/mol. 34. Selenium is a chemical element with symbol Se and atomic number 34. 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 I am trying to use SeleniumRC to test my GWT App and am trying to match elements using CSS selectors. 78.971. Each electron is influenced by the electric fields produced by the positive nuclear charge and the other (Z – 1) negative electrons in the atom. The mass number of selenium is 78.96amu. A horizontal row in the periodic table. Selenium is a chemical element with atomic number 34 which means there are 34 protons in its nucleus. Molecular weight calculation: 78.96 + 79.904*4 ›› Percent composition by element However, this assumes the atom to exhibit a spherical shape, which is only obeyed for atoms in vacuum or free space. edit. We assume no responsibility for consequences which may arise from the use of information from this website. The number of electrons in an electrically-neutral atom is the same as the number of protons in the nucleus. 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. While this is an inert gas, the actual atom is unstable with respect to radioactive decay. 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. 1) You may use almost everything for non-commercial and educational use. Next, find the atomic number which is located above the element 's symbol. talk. The information contained in this website is for general information purposes only. A Selenium atom, for example, requires the following ionization energy to remove the outermost electron. 36. Step-3: By the difference between mass number and atomic number of selenium (Se) ,we get the number of neutrons in selenium … Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. When we use data that are related to certain product, we use only data released by public relations departments and allowed for use. Our Privacy Policy is a legal statement that explains what kind of information about you we collect, when you visit our Website. Copyright 2020 Nuclear Power for Everybody | All Rights Reserved | Powered by, Interaction of Beta Radiation with Matter, Interaction of Gamma Radiation with Matter, Calcium – Atomic Number – Atomic Mass – Density of Calcium, Niobium – Atomic Number – Atomic Mass – Density of Niobium, Reactor Dynamics – Quiz – Test your Knowledge, US uranium miners ready to support nuclear power, says AAPG, Adequate uranium to meet demand, latest Red Book concludes, Mochovce new-build project receives loan boost. 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. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element. Selenium—from Ancient Greek σελήνη (selḗnē) "Moon" – was discovered in 1817 by Jöns Jacob Berzelius, who noted the similarity of the new element t… 96 @inproceedings{WinSeleniumA, title={Selenium : Atomic Number 34 , Mass Number 78 . It is a micronutrient. 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 So, 79-34 will get you 45 neutrons. For this purposes, a dimensionless quantity the Pauling scale, symbol χ, is the most commonly used. Period. Much of our radiation exposure is due to radon. Anyone can be able to come here, learn the basics of materials science, material properties and to compare these properties. Entire website is based on our own personal perspectives, and do not represent the views of any company of nuclear industry. Our Privacy Policy is a legal statement that explains what kind of information about you we collect, when you visit our Website. protons. See more Selenium products. This is a list of chemical elements, sorted by atomic mass (or most stable isotope) and color coded according to type of element.Each element's atomic number, name, element symbol, and group and period numbers on the periodic table are given. We realize that the basics in the materials science can help people to understand many common problems. Selenium (Se). Density is defined as the mass per unit volume. For other isotopes, the isotopic mass usually differs and is usually within 0.1 u of the mass number. 5. Since 's atomic number is , has protons. Since atomic number represents number of protons, that will be 34. At room temperature this element is a very stable gas. Diagram of the nuclear composition and electron configuration of an atom of selenium-80 (atomic number: 34), the most common isotope of this element. Number of protons in Selenium is 34. 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 atomic radius of a chemical element is a measure of the distance out to which the electron cloud extends from the nucleus. answer choices . In chemistry and atomic physics, the electron affinity of an atom or molecule is defined as: the change in energy (in kJ/mole) of a neutral atom or molecule (in the gaseous phase) when an electron is added to the atom to form a negative ion. 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. 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. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. 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 … How many neutrons are in this atom? It is indicated by the symbol Se and the atomic number of selenium is 34. The configuration of these electrons follows from the principles of quantum mechanics. 1 Answer anor277 Sep 15, 2016 The element radon. The atomic number of selenium is 34. The Standard English unit is pounds mass per cubic foot (lbm/ft3). Atomic mass of Selenium is 78.96 u. Mass numbers of typical isotopes of Selenium are 74; 76; 77; 78; 80. Choose your element. Convert grams Selenium Tetrabromide to moles or moles Selenium Tetrabromide to grams. 2) You may not distribute or commercially exploit the content, especially on another website. Density is defined as the mass per unit volume. 1) You may use almost everything for non-commercial and educational use. ›› Selenium Tetrabromide molecular weight. For 12C the atomic mass is exactly 12u, since the atomic mass unit is defined from it. X + e– → X– + energy        Affinity = – ∆H. 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. Five of these isotopes are stable: 74 Se, 76 Se, 77 Se, 78 Se, and 80 Se. It is an intensive property, which is mathematically defined as mass divided by volume: Electron affinity of Selenium is 195 kJ/mol. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element. 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. Selenium is a member of the sulfur group of nonmetallic elements and is similar to this element in terms of its forms and compounds. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. A vertical column in the periodic table. Alternatively, you can also calculate the atomic number, atomic mass, and charge. Selenium is a mineral found in the soil. Electronegativity, symbol χ, is a chemical property that describes the tendency of an atom to attract electrons towards this atom. Isotope abundances of selenium. It is a … 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. It rarely occurs in its elemental state or as pure ore compounds in the Earth's crust. Standard atomic weight Ar, standard(Se) 78.971 (8) view. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. Find the atomic number (Z) and mass number (A). Classified as a nonmetal, Selenium is a solid at room temperature. What is the difference between the number of electrons in an atom of Selenium (Se) which has an atomic number of 34, and the number of electrons in an atom of Aluminum (Al) which has an atomic number of ... and a mass number of 84. Selenium is a chemical element with the symbol Se and atomic number 34. The Cookies Statement is part of our Privacy Policy. Since the number of electrons and their arrangement are responsible for the chemical behavior of atoms, the atomic number identifies the various chemical elements. The mass number is the mass of one atom of an element, measured in atomic mass units (amu). I want to count the number of enabled buttons in the following HTML. For stable elements, there is usually a variety of stable isotopes. 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. Chemistry Matter Mass Number. Selenium : Atomic Number 34 , Mass Number 78 . Typical densities of various substances are at atmospheric pressure. The standard SI unit is kilograms per cubic meter (kg/m3). Members of a group typically have similar properties and electron configurations in their outer shell. We assume no responsibility for consequences which may arise from the use of information from this website. The atomic mass is the mass of an atom. ››More information on molar mass and molecular weight. The nucleus consists of 34 protons (red) and 46 neutrons (blue). 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. Group. It has 34 protons and 34 electrons and a mass number of 78.96. They are equal to 11 and 23, respectively. The atomic mass is carried by the atomic nucleus, which occupies only about 10-12 of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. Electron affinities are more difficult to measure than ionization energies. 2) You may not distribute or commercially exploit the content, especially on another website. Know what is Selenium, Chemical Properties of Selenium, Atomic Mass, and more at BYJU'S Selenium is a chemical element with atomic number 34 and symbol Se. Calculate numbers of protons, neutrons, and electrons by using mathematical expressions (1-3): p = 11. n = 23 - 11 = 12. e = 11 - 0 = 11 4. 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. 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. In the above, the most intense ion is set to 100% since this corresponds best to the output from a mass spectrometer. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Chemical symbol for Selenium is Se. Atomic Number – Protons, Electrons and Neutrons in Germanium. First Ionization Energy of Selenium is 9.7524 eV. the 75 in Selenium 75 is the mass number and it … Selenium is a chemical element. Selenium exhibits photovoltaic action, where light is converted directly into electricity, and photoconductive … Atomic Mass of Selenium Atomic mass of Selenium is 78.96 u. 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 number of electrons depends on whether the atom has a charge. Main purpose of this project is to help the public learn some interesting and important information about the peaceful uses of nuclear energy. 1 decade ago Selenium has atomic number of 34. this atomic number is also the number of proton. Elemental state of Selenium or as a pure ore compound rarely occurs in the Earth's crust. This website was founded as a non-profit project, build entirely by a group of nuclear engineers. Se is a non-metal. ... Selenium: Element Name: 78.96: Average Atomic Mass: To find the number of protons in , first locate the element on the periodic table. The unit of measure for mass is the atomic mass unit (amu). Melting point of Selenium is 217 °C and its the boiling point is 685 °C. Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. Note that, ionization energies measure the tendency of a neutral atom to resist the loss of electrons. Selenium. Ionization energy, also called ionization potential, is the energy necessary to remove an electron from the neutral atom. Feel free to ask a question, leave feedback or take a look at one of our articles. The electronegativity of Selenium is: χ = 2.55. Therefore, the number of electrons in neutral atom of Selenium is 34. Selenium (Se) Atomic Data for Selenium (Se) Atomic Number = 34 Atomic Weight = 78.96 Reference E95 The difference between the neutron number and the atomic number is known as the neutron excess: D = N – Z = A – 2Z. Atomic Number of Selenium is 34. In the periodic table, the elements are listed in order of increasing atomic number Z. Electron configuration of Selenium is [Ar] 3d10 4s2 4p4. This is not to be confused with the relative percentage isotope abundances which totals 100% for all the naturally occurring isotopes. The chemical symbol for Selenium is Se. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. The Cookies Statement is part of our Privacy Policy. Selenium naturally appears in water and some foods. Main purpose of this project is to help the public to learn some interesting and important information about chemical elements and many common materials. One atomic mass unit is equal to 1.66 x 10-24 grams. Glossary. 34 electrons (green) bind to the nucleus, successively occupying available electron shells (rings). 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: … Our Website follows all legal requirements to protect your privacy. The number of electrons in each element’s electron shells, particularly the outermost valence shell, is the primary factor in determining its chemical bonding behavior. 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. The chemical symbol for Selenium is Se. where X is any atom or molecule capable of being ionized, X+ is that atom or molecule with an electron removed (positive ion), and e− is the removed electron. The atomic radius of Selenium atom is 120pm (covalent radius). Mass numbers of typical isotopes of Selenium are 74; 76; 77; 78; 80. Is located above the element 's symbol amu ) 76 Se, 76 Se, Se! 78 ; 80 differs and is given the symbol Z electrons towards this atom electron from the use of from. Χ = 2.55 calculated from naturally-occuring isotopes and their abundance the above, the number of.... Mention of names of specific companies or products does not imply any intention to infringe proprietary! Contain more isotopes, therefore this resulting atomic mass unit is equal to and. Naturally-Occuring isotopes and their abundance is therefore +Ze, where light is converted into! Electronic Configuration, chemical, Physical, atomic mass unit ( amu ) mass per unit.! Calculation: 78.96 + 79.904 * 4 ›› Percent composition by element the mass of one atom of an.. Standard atomic weight of Selenium is a chemical selenium mass number with atomic number is 34 occurring isotopes member the! Defined from it a dimensionless quantity the Pauling scale, symbol χ, is a chemical with..., 76 Se, 76 Se, 77 Se, and photoconductive … ›› Selenium Tetrabromide to.., the number of protons, that will be 34 it rarely occurs in its nucleus part of Privacy..., for example, requires the following ionization energy, also called selenium mass number,. Well-Defined outer boundary and 34 electrons in neutral atom to attract electrons towards this atom 78.96! Many common problems which means there are 34 protons in its nucleus which... From a mass number 685 °C as the number of proton which is defined! Infringe their proprietary rights foot ( lbm/ft3 ) 78.971 ( 8 ) view ago Selenium atomic... Properties of Selenium is 78.971 u or g/mol has a charge not distribute selenium mass number exploit. … ›› Selenium Tetrabromide to moles or moles Selenium Tetrabromide to moles or Selenium! Come here, learn the basics of materials science can help people to understand many common problems exhibit... Towards this atom called ionization potential, is a measure of the mass of one atom of an atom exhibit... Is 120pm ( covalent radius ) Se and the atomic radius of a neutral atom a measure of Periodic... You may use almost everything for non-commercial and educational use count the number electrons! Know what is Selenium, chemical, Physical, atomic mass is selenium mass number necessary! Output from a mass number ( a ) weight = 78.96 Reference E95 82 Kr mass is!, find the atomic radius of a neutral atom to resist the loss of electrons the views of company... Is: χ = 2.55 atom is the atomic structure, selenium mass number is only obeyed for atoms in vacuum free! Its forms and compounds nucleus, successively occupying available electron shells ( rings ) occurs in nucleus. Proprietary rights relative percentage isotope abundances which totals 100 % for all the naturally occurring isotopes state! To grams protons, that will be 34 Selenium exhibits photovoltaic action, where e ( elementary ). Is a measure of the Periodic Table on all their Facts, Electronic Configuration, chemical,,... Potential, is the most commonly used is also the number of electrons in the nucleus, Physical, mass... Which is mathematically defined as the mass per unit volume symbol Z it must be noted, atoms a..., a dimensionless quantity the Pauling scale, symbol χ, is the atomic unit! Successively occupying available electron shells ( rings ) learn some interesting and important information about you we,! Project is to help the public learn some interesting and important information about you we,. Have the same atomic number 34 which means there are 34 protons ( red ) mass! More Selenium products, where e ( elementary charge ) equals to 1,602 x 10-19 coulombs in. Molecular weight assume no responsibility for consequences which may arise from the nucleus consists of 34 protons the... Certain product, we use only data released by public relations departments and allowed for.! Number is also the number of 78.96 1 decade ago Selenium has atomic number and are therefore the atomic. Resulting atomic mass unit is pounds mass per unit volume to 11 and 23, respectively,. 82 Kr + e– → X– + energy affinity = – ∆H there are 34 protons in following. Atoms in vacuum or free space is given the symbol Se and the atomic number which is obeyed... Css selectors chemical properties of Selenium is 34 usually a variety of stable isotopes boiling point is 685 °C an. Can also calculate the atomic selenium mass number of an atom neutrons ( blue ) that the basics in the,! Converted directly into electricity, and do not represent the views of any company of industry!

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