O 34 P+, 29 Nº, 63 E- 53 P+, 74 N°, 53 E- O 34 P+, 45 N°, 34 E- O 53 P+, 34 Nº, 52 E-This problem has been solved! What Is the Electron Configuration of Selenium. Isotopic compositions and standard atomic masses from: Half-life, spin, and isomer data selected from the following sources. This page was last edited on 28 October 2020, at 22:11. By looking at the electron configuration of selenium, it is possible to determine how many electrons are in each sub-shell. In selenium, the first energy level has two electrons in sub-shell s. The second energy level holds eight electrons. selenium is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p4. 36 Electrons = Atomic Number + 2 extra electrons (hence the 2-) The chemical symbol for Selenium is Se . ... Identify the metalloid in period 4 that is more reactive than Selenium. There are five sub-shells, but only four of them are used by naturally occurring elements: s, p, d and f. Each sub-shell accommodates a certain number of electrons. Indeed, the toxicity level of selenium to humans was established only 20 years ago by studies of Chinese victims of selenium poisoning, selenosis, who grew corn on selenium rich coal rocks. It usually occurs in the sulfide ores of the heavy metals but rarely as the free element. 51 V has a mass of 50.943962u and an abundance of 99.750%. Selenium (atomic symbol: Se, atomic number: 34) is a Block P, Group 16, Period 4 element with an atomic radius of 78.96. Gold is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal. Phosphorus. The chemical symbol for Selenium is Se. Two of those electrons are in sub-shell s, while the other six are found in sub-shell p. The third energy level has a total of 18 electrons. - e-eduanswers.com Estate Planning 101: How to Probate a Will, The Differences Between “Defamation,” “Libel” and “Slander”. 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 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. Hydrogen selenide (H 2 Se) Sodium selenite (Na 2 SeO 3) Selenious acid (H 2 SeO 3) Selenium trioxide (SeO 3) Interesting facts: It is similar to sulfur in its form and compounds. Fluorine. Selenium is two electrons short of having a full valance shell, so a stable ion of selenium will have a 2- charge. 36. Researchers Are Now Much Closer to Finding Out. Identify the nonmetal in period 3 that is less reactive than Sulfur. Sub-shells s, p, d and f hold a maximum of two, six, 10 and 14 electrons, respectively. Its yield is low (about 0.04%), as it is near the lower end of the mass range for fission products. Expert Answer . The last three also occur as fission products, along with 79 Se, which has a half-life of … Sub-shells s, p, d and f hold a maximum of two, six, 10 and 14 electrons, respectively. Electron Affinity and Electronegativity of Selenium. It decreases electrical resistance with increased illumination. Also the electron configuration of Se is [Ar]3d 10 4s 2 4p 4 so there are 4 energy levels and 6 valence electrons. The electron configuration of an atom shows how the electrons are arranged in the atom's energy levels. It is one of only 7 long-lived fission products. Electron Affinity of Selenium is 195 kJ/mol. In the above, the most intense ion is set to 100% since this corresponds best to the output from a mass spectrometer. Selenium primarily occurs in vivo as selenocompounds, mostly selenoproteins such as glutathione peroxidase and thioredoxin reductase (enzymes responsible for detoxification). Volcanic soils are enriched in selenium as are some coal deposits. The first two electrons go into the 1s shell-subshell combination. The electron configuration for selenium is 1s22s22p63s23p64s23d104p4. It can convert AC … The n = 2 shell also has a p subshell, so the remaining two electrons can go into the 2p subshell. It emits γ rays with 0.265 eV (59%) and 0.280 eV (25%), and decays with a half-life time of 120.4 days. Two of those electrons are in sub-shell s, while the other six are found in sub-shell p. The third energy level has a total of 18 electrons. It converts light into electricity. To determine how many total electrons there are, add the amount of charge to the atomic number. The selenium atom has a radius of 120 pm and a Van der Waals radius of 190 pm. Five of these isotopes are stable: 74Se, 76Se, 77Se, 78Se, and 80Se. 29 29 29 35 Describe the general arrangement of subatomic particles in the atom. See more Selenium products. How many electrons have ml=+2 See the answer. Identify the element with 79 protons. This configuration conveys a lot of important information about an element. Selenium (Se). Of the other isotopes, 73Se has the longest half-life, 7.15 hours; most others have half-lives not exceeding 38 seconds. In this case, there are fewer protons than electrons. They are vanadium-50 and vanadium-51. Electronegativity of Selenium is 2.55. There are two electrons in sub-shell s and four electrons in sub-shell p. The number of electrons in all of the energy levels adds up to 34. # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN). Argon. For example, N 3-has a -3 charge which means it has 3 more electrons than a neutral nitrogen atom. The chemical symbol for Selenium is 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 "Atomic weights of the elements 2013 (IUPAC Technical Report)", "Atomic weights of the elements. Selenium is a chemical element with atomic number 34 which means there are 34 protons and 34 electrons in the atomic structure. This configuration is also written as [Ar] 4s23d104p4, according to Dr. Anne Marie Helmenstine, a contributor to About.com. Identify the metalloid in period 4 with 4 valence electrons. Correct answer to the question Se has an atomic number of 34 and an atomic mass of 79. Identify the nonmetal in period 4 that is more reactive than Selenium. Identify the element with 79 electrons. Selenium is a nonmetallic chemical element found in trace amounts in human body.
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