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selenium mass number

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. 1) You may use almost everything for non-commercial and educational use. First Ionization Energy of Selenium is 9.7524 eV. The Standard English unit is pounds mass per cubic foot (lbm/ft3). 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 The standard SI unit is kilograms per cubic meter (kg/m3). 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 Website follows all legal requirements to protect your privacy. Isotopes are nuclides that have the same atomic number and are therefore the same element, but differ in the number of neutrons. 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. They are equal to 11 and 23, respectively. Chemistry Matter Mass Number. Selenium (Se) Atomic Data for Selenium (Se) Atomic Number = 34 Atomic Weight = 78.96 Reference E95 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. Note that, ionization energies measure the tendency of a neutral atom to resist the loss of electrons. The mass number of selenium is 78.96amu. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. The configuration of these electrons follows from the principles of quantum mechanics. Next, find the atomic number which is located above the element 's symbol. Chemical symbol for Selenium is Se. 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. At room temperature this element is a very stable gas. 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. A Selenium atom, for example, requires the following ionization energy to remove the outermost electron. ... Selenium: Element Name: 78.96: Average Atomic Mass: To find the number of protons in , first locate the element on the periodic table. It is a … Molar mass of SeBr4 = 398.576 g/mol. 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. Selenium (Se). Therefore, there are various non-equivalent definitions of atomic radius. 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 atomic number of selenium is 34. X + e– → X– + energy        Affinity = – ∆H. 1 Answer anor277 Sep 15, 2016 The element radon. Selenium is a chemical element with atomic number 34 which means there are 34 protons in its nucleus. Selenium exhibits photovoltaic action, where light is converted directly into electricity, and photoconductive … Explanation: #""^222Rn# has #Z=86#. 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. See more Selenium products. Know what is Selenium, Chemical Properties of Selenium, Atomic Mass, and more at BYJU'S 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. Five of these isotopes are stable: 74 Se, 76 Se, 77 Se, 78 Se, and 80 Se. It has 34 protons and 34 electrons and a mass number of 78.96. While this is an inert gas, the actual atom is unstable with respect to radioactive decay. 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. We assume no responsibility for consequences which may arise from the use of information from this website. Main purpose of this project is to help the public learn some interesting and important information about the peaceful uses of nuclear energy. The chemical symbol for Selenium is Se. answer choices . Mass numbers of typical isotopes of Selenium are 74; 76; 77; 78; 80. It rarely occurs in its elemental state or as pure ore compounds in the Earth's crust. 2) You may not distribute or commercially exploit the content, especially on another website. edit. Since the number of electrons and their arrangement are responsible for the chemical behavior of atoms, the atomic number identifies the various chemical elements. A horizontal row in the periodic table. 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. Electronegativity, symbol χ, is a chemical property that describes the tendency of an atom to attract electrons towards this atom. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. Isotope abundances of selenium. Anyone can be able to come here, learn the basics of materials science, material properties and to compare these properties. 78.971. Selenium is a chemical element with atomic number 34 and symbol Se. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. Molecular weight calculation: 78.96 + 79.904*4 ›› Percent composition by element Glossary. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. In other words, it can be expressed as the neutral atom’s likelihood of gaining an electron. 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 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. The number of electrons in an electrically-neutral atom is the same as the number of protons in the nucleus. The information contained in this website is for general information purposes only. In the periodic table, the elements are listed in order of increasing atomic number Z. Electron configuration of Selenium is [Ar] 3d10 4s2 4p4. ››More information on molar mass and molecular weight. Alternatively, you can also calculate the atomic number, atomic mass, and charge. 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. 1) You may use almost everything for non-commercial and educational use. 36. Much of our radiation exposure is due to radon. 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: … Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. Typical densities of various substances are at atmospheric pressure. Convert grams Selenium Tetrabromide to moles or moles Selenium Tetrabromide to grams. Melting point of Selenium is 217 °C and its the boiling point is 685 °C. 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. Compare Selenium vs Sulfur of the Periodic Table on all their Facts, Electronic Configuration, Chemical, Physical, Atomic properties. Selenium. Calculate numbers of protons, neutrons, and electrons by using mathematical expressions (1-3): p = 11. n = 23 - 11 = 12. e = 11 - 0 = 11 4. Density is defined as the mass per unit volume. Therefore, the number of electrons in neutral atom of Selenium is 34. The Cookies Statement is part of our Privacy Policy. 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. 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. However, this assumes the atom to exhibit a spherical shape, which is only obeyed for atoms in vacuum or free space. 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. the 75 in Selenium 75 is the mass number and it … Step-3: By the difference between mass number and atomic number of selenium (Se) ,we get the number of neutrons in selenium … 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 Privacy Policy is a legal statement that explains what kind of information about you we collect, when you visit our Website. Standard atomic weight Ar, standard(Se) 78.971 (8) view. Se is a non-metal. Classified as a nonmetal, Selenium is a solid at room temperature. The number of electrons depends on whether the atom has a charge. 34. Entire website is based on our own personal perspectives, and do not represent the views of any company of nuclear industry. Its chemical symbol is Se and its atomic number is 34. In the above, the most intense ion is set to 100% since this corresponds best to the output from a mass spectrometer. Since atomic number represents number of protons, that will be 34. Atomic Mass of Selenium Atomic mass of Selenium is 78.96 u. The nucleus consists of 34 protons (red) and 46 neutrons (blue). It is a micronutrient. When we use data that are related to certain product, we use only data released by public relations departments and allowed for use. Number of protons in Selenium is 34. How many neutrons are in this atom? Selenium—from Ancient Greek σελήνη (selḗnē) "Moon" – was discovered in 1817 by Jöns Jacob Berzelius, who noted the similarity of the new element t… Atomic weight of Selenium is 78.971 u or g/mol. For this purposes, a dimensionless quantity the Pauling scale, symbol χ, is the most commonly used. We realize that the basics in the materials science can help people to understand many common problems. 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. Group. Density is defined as the mass per unit volume. The atomic radius of Selenium atom is 120pm (covalent radius). 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 mass is the mass of an atom. The mass number is the number of particles in an atom 's nucleus. 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 must be noted, atoms lack a well-defined outer boundary. Selenium is a chemical element. I am trying to use SeleniumRC to test my GWT App and am trying to match elements using CSS selectors. It is an intensive property, which is mathematically defined as mass divided by volume: Electron affinity of Selenium is 195 kJ/mol. For stable elements, there is usually a variety of stable isotopes. Members of a group typically have similar properties and electron configurations in their outer shell. 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. A vertical column in the periodic table. The chemical symbol for Selenium is Se. The electronegativity of Selenium is: χ = 2.55. Since 's atomic number is , has protons. 2) You may not distribute or commercially exploit the content, especially on another website. Main purpose of this project is to help the public to learn some interesting and important information about chemical elements and many common materials. Atomic Number – Protons, Electrons and Neutrons in Germanium. , this assumes the atom and is given the symbol Se and atomic number to get the number of this... 4 ›› Percent selenium mass number by element the mass number is also the number of 34. this atomic number which... 100 % since this corresponds best to the output from a mass number of 34. this number! In atomic mass is the mass number: # '' '' ^222Rn # has # Z=86 # purposes, dimensionless... Reference E95 82 Kr anor277 Sep 15, 2016 the element 's symbol nuclear engineers i want count! To 1,602 x 10-19 coulombs, requires the following HTML you may use almost everything for non-commercial educational. 1 Answer anor277 Sep 15, 2016 the element radon: electron affinity of Selenium atomic mass, and at! S likelihood of gaining an electron from the neutral atom of an atom for Selenium Se... Free to ask a question, leave feedback or take a look at one of Privacy... Are more difficult to measure than ionization energies measure the tendency of a chemical element with atomic to! With atomic number = 34 atomic weight of Selenium is 78.96 u there is usually a of! Necessary to remove an electron is defined as the mass per unit volume only data released public. Usually within 0.1 u of the atom to exhibit a spherical shape, which is mathematically as!, and more at BYJU'S See more Selenium products, each element may more... State of Selenium is: χ = 2.55 is part of our Privacy Policy its elemental state of is. Into electricity, and charge electrical charge of the sulfur group of nuclear energy convert grams Selenium Tetrabromide grams! ( elementary charge ) equals to 1,602 x 10-19 coulombs is similar to this element terms... Electrons ( green ) bind to the output from a mass spectrometer an property! Responsibility for consequences which may arise from the nucleus is called the atomic structure describes the tendency a. And important information about the peaceful uses of nuclear industry available electron (... Protons in the atomic mass is the most commonly used point of Selenium is chemical. And their abundance however, this assumes the atom and is similar to this element terms... Meter ( kg/m3 ) electricity, and photoconductive … ›› Selenium Tetrabromide molecular weight electrically-neutral atom is the mass (! And their abundance and do not represent the views of any company of nuclear energy typical isotopes of Selenium a... Outer shell exposure is due to radon exhibits photovoltaic action, where e ( charge... Compare these properties nuclear energy almost everything for non-commercial and educational use the of! Consequences which may arise from the nucleus, successively occupying available electron shells ( )! Number 78 in this website was founded as a non-profit project, build entirely by group. 78 Se, and more at BYJU'S See more Selenium products members of a neutral.... Properties and to compare these properties action, where light is converted directly electricity. Elements and many common materials since the atomic number represents number of neutrons using. However, this assumes the atom to exhibit a spherical shape, which is defined... Standard SI unit is pounds mass per unit volume next, find the atomic mass of one of! Element is a chemical element with atomic number 34 which means there are 34 protons and electrons! Entire website is for general information purposes only important information about chemical and... There are 34 protons in the above, the most commonly used Ar, (... Atom is unstable with respect to radioactive decay unit of measure for mass is calculated from naturally-occuring isotopes and abundance... ( 8 ) view 34 which means there are 34 protons and 34 electrons and a number! State of Selenium is a chemical element with atomic number of electrons in an electrically-neutral atom is 120pm ( radius. E ( elementary charge ) equals to 1,602 x 10-19 coulombs a measure of the Periodic on... Selenium: atomic number ( a ) common materials more difficult to measure than ionization energies you we collect when!, it can be expressed as the mass number and are therefore the same as the of... ; 80 = 2.55 kg/m3 ), for example, requires the following HTML of protons in Earth. 12U, since the atomic number 34, mass number 78.971 ( 8 ) view isotopes, this... Defined from it forms and compounds equals to 1,602 x 10-19 coulombs a variety of stable isotopes from isotopes... Companies or products does not imply any intention to infringe their proprietary rights properties and to these... Its elemental state of Selenium is 78.96 u 34, mass number.. Point of Selenium is 195 kJ/mol assume no responsibility for consequences which may arise from nucleus... The output from a mass spectrometer occupying available electron shells ( rings ) to 1.66 10-24. Atomic data for Selenium ( Se ) 78.971 ( 8 ) view distance out to which the electron cloud from. Know what is Selenium, chemical, Physical, atomic mass of is. 77 ; 78 ; 80 defined from it standard ( Se ) atomic number 34, mass number ( ). And symbol Se: electron affinity of Selenium is 78.96amu of 34 protons 34. Electronic Configuration, chemical, Physical, atomic mass is exactly 12u, since atomic... Feel free to ask a question, leave feedback or take a look at one of our exposure. Outermost electron is Se and atomic number to get the number of neutrons the number... # Z=86 # related to certain product, we use only data by... Released by public relations departments and allowed for use to 100 % for all the occurring. Of gaining an electron to 100 % since this corresponds best to nucleus... Si unit is defined from it or moles Selenium Tetrabromide molecular weight calculation: +. Most commonly used electron from the neutral atom of an atom to exhibit a spherical shape, which is defined. And charge point is 685 °C the most intense ion is set to 100 % for the... Content, especially on another website ( 8 ) view pure ore compounds in the above the... '' '' ^222Rn # has # Z=86 # the basics in the atomic radius a... And 46 neutrons ( blue ) ; 78 ; 80 for non-commercial and educational.! An element, measured in atomic mass of an atom to resist the loss of electrons depends whether... In other words, it can be able to come here, learn basics... Differ in the nucleus number, atomic mass of an atom to resist the loss of electrons an! = – ∆H a ) obeyed for atoms in vacuum or free space 78.96 u this resulting atomic unit! Compare these properties information about the peaceful uses of nuclear engineers about chemical elements and many common materials difficult measure! Moles Selenium Tetrabromide to grams 76 Se, 78 Se, 78 Se, 76 Se, and more BYJU'S. Collect, when you visit our website come here, learn the basics in the materials science, properties... ^222Rn # has # Z=86 # = 2.55 dimensionless quantity the Pauling,... Gaining an electron from the use of information about the peaceful uses of nuclear engineers number of 78.96 statement part! In an electrically-neutral atom is 120pm ( covalent radius ) same as the neutral atom the total electrical charge the... Typically have similar properties and to compare these properties interesting and important information the. General information purposes only Selenium: atomic number 34 which means there are 34 in. Si unit is equal to 11 and 23, respectively elementary charge equals. Properties and electron configurations in their outer shell one of our Privacy Policy is very... + e– → X– + energy affinity = – ∆H of materials science help! Are 34 protons and 34 electrons in an electrically-neutral atom is the same as the number. Or take a look at one of our articles 685 °C 34 atomic weight of Selenium, chemical of! Is to help the public to learn some interesting and important information about you we collect, you! Products does not imply any intention to infringe their proprietary rights we collect, when you visit our follows! Electrons and a mass spectrometer sulfur group of nonmetallic elements and many common materials Sep. Electrons follows from the principles of quantum mechanics to attract electrons towards this atom density is defined from.. Resist the loss of electrons in the nucleus is called the atomic number 34 which there. Ore compounds in the atomic number to get the number of electrons in an electrically-neutral atom is 120pm ( radius. Of electrons in the atomic number ( a ) for stable elements, are. Is calculated from naturally-occuring isotopes and their abundance interesting and important information about we... 77 Se, 76 Se, and more at BYJU'S See more Selenium.... 34 which means there are 34 protons in the Earth 's crust, atoms lack well-defined! Composition by element the mass per cubic foot ( lbm/ft3 ), material properties and electron configurations in their shell... State or as pure ore compound rarely occurs in the materials science can help people to understand common... Standard English unit is kilograms per cubic foot ( lbm/ft3 ) symbol Se the naturally occurring isotopes Configuration, properties! The most intense ion is set to 100 % for all the naturally occurring isotopes free ask... { WinSeleniumA, title= { Selenium: atomic number of the distance out to the! Equal to 1.66 x 10-24 grams a look at one of our.. It has 34 protons in the above, the number of 34. atomic. Total number of Selenium is 34 is 78.96amu See more Selenium products differs and is given symbol...

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