II. Having too many or too few neutrons relative to protons results in an unstable, or radioactive, nucleus that will sooner or later break down to a more stable form. When writing an isotope, the overall number of protons + neutrons (nucleons) in the nucleus is listed. The lesson is about the discovery of the element rhenium by Masataka Ogawa, Walter Noddack, and Ida Tacke. Among elements with a known stable isotope, only indium and tellurium similarly occur with a stable isotope in lower abundance than the long-lived radioactive isotope. How many Protons/Neutrons does Re-186 have ? You get the neutrons by subtracting the atomic number from the atomic mass.185 is … Atomic Number of Fluorine. 5. This Site Might Help You. crucial step in the interpretation of the {sup 187}Os/{sup 187}Re pair as a cosmochronometer. Anyone can earn . All others have half-lives less than a day. The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. Neutrons released by a fission reaction must be slowed by collisions with the moderator nuclei before the neutrons can cause further fissions. Re-185 isotope is used for research in nuclear physics; Re-185 isotope is used for Rhenium-186 (Re-186 isotope, 186Re isotope) radionuclide (radioisotope) production (can be used in life science for healthcare and medical applications and pharmaceuticals industries); 55 B. 0 0. Number of Neutrons: 111: Number of Electrons: 75: Melting Point: 3180.0° C: Boiling Point: 3627.0° C: Density: 21.02 grams per cubic centimeter: Normal Phase: Solid: Family: Transition Metals: Period: 6: Cost : $250 per troy ounce . Such blank positions are able to receive 17 extra neutrons of positive spins and 17 extra neutrons of negative spins. ... How many protons and electrons does the most stable … 75 C. 130 D. 185 Get the answers you need, now! CROSS SECTIONS OF THE REACTIONS $sup 186$W(n,2n)$sup 185$W, $sup 184$W(n,$gamma$)$sup 185$W, $sup 186$W(n,$gamma$W$sup 187$W FOR FISSION NEUTRONS AND $sup 186$W(n,2n)$sup 185$W AND $sup 182$W(n,2n)$sup 181$W FOR 14.8-Mev NEUTRONS. Because the next magic number for neutrons should be 184, it was suggested that an element with 114 protons and 184 neutrons might be stable enough to exist in nature. ___ The number of neutrons in a 185 Re 4+ ion is A ) 185 B ) 75 C ) 110 D ) 71. o. Re-183 00 Re-187 i. Re-189 e. Re-181 Y. Re-190 t8C.2 . (AIP), TOTAL NEUTRON CROSS SECTIONS OF $sup 185$Re AND $sup 187$Re. The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. Fnesenhahn et al. Belinda. There are many unstable isotopes of Rhenium but Rhenium 185 is the only stable isotope. Re-186 has 75 protons and 111 neutrons. 6. Alpha-induced reactions: 9Be α,n) 12 C +5.7 MeV 2. please. a) 35 b) 45 c) 46 d) 70 e) 81 6. Rhenium-185 has in its nucleus Select one: a. D) 75 protons, 110 neutrons. Too many protons (or too few neutrons) in the nucleus result in an imbalance between forces, which leads to nuclear instability. The U.S. Department of Energy's Office of Scientific and Technical Information Atomic Number of Fluorine. EVIDENCE FOR INTERMEDIATE-STATE STRUCTURE FROM RESONANCE NEUTRON CAPTURE IN $sup 185$Re AND $sup 187$Re. 75 protons, 75 neutrons b. The (n,n{sup '}) cross section of {sup 187}Os at 30 keV neutron energy, Ratio of neutron capture cross sections for /sup 186/Os and /sup 187/Os at 25 keV neutron energy. Spontaneous fission: 252 Cf(sf) 134 Te+ 115 Pd+3n +212 MeV 5. And so let's look and see what happens here. Among elements with a known stable isotope, only indium and tellurium similarly occur with a stable isotope in lower abundance than the long-lived radioactive isotope.. How many different elementary particles are found in the nuclide Re-186? 75 protons, 130 neutrons c. 130 protons, 75 neutrons d. 75 protons, 110 neutrons e. not enough information Get Answer. One of the most stable types of potassium atoms has the mass number 39. It is obvious the infinite multiplication factor in a multiplying system is a measure of the change in the fission neutron population from one neutron generation to the subsequent generation. Suppose a 1.5-MeV neutron leaves each collision with 65% of its incident energy. - Phys. Fluorine is a chemical element with atomic number 9 which means there are 9 protons and 9 electrons in the atomic structure.The chemical symbol for Fluorine is F. Atomic Mass of Fluorine. Count the number of neutrons in Cesium-130/55 (Cs) A. Rhenium-188 is a radioisotope for treatment of cancer. Figure \(\PageIndex{1}\): Competing Interactions within the Atomic Nucleus. There are also numerous isomers, the longest-lived of which are 186mRe with a half-life of 200,000 years and 184mRe with a half-life of 169 days. (k ∞) 100 = 1105 neutrons after hundred generations.. Rhenium has two naturally occurring isotopes: Re-185 with a natural abundance of 37.40%, and with a Re-187 natural abundance of 62.60%. How many collisions are required to reduce the neutron’s energy to at least 0.040 eV, which is the energy of a thermal neutron? Problem 24. Known/Given: atomic weight of Re = 186.207 u x = atomic weight of Re-185 in u (371.9087 - x) = atomic weight of Re-187 in u … In a search for intermediate structure, neutron time-of-flight spectra corresponding to 1 and 4 MeV capture γ-ray thresholds were measured for the target isotopes 185, 187 185, 187 The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. There was … View the step-by-step solution to: Question 14)___ The number of neutrons in a 185 Re 4+ ion is A) 185 B) 75 C) 110 D) 71. Currently, rhenium alloys are used in the engines of fighter jets.Did you know… We have over 200 college Rhenium-185 has in its nucleus. Photo-dissociation: 9Be( γγγ,n)2 α-1.66 MeV 4. I need help. C) 130 protons, 75 neutrons. EVALUATION OF $sup 185$Re AND $sup 187$Re NEUTRON CROSS SECTIONS FOR THE ENDF/B LIBRARY. Spin coupling. I have this project due tomorrow on rhenium. On the bases of this ratio, the age of the universe was determined via the Re--Os ..beta..-decay clock to be approximately 19 x 10/sup 9/ years. Answer Save. Anonymous. The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. a. α d. γray b. β e. X-ray c. positron Sep 15 Re-187 can be used for the production of Re-188 which is used for cancer therapy and restenosis, though most Re-188 is produced via W-186. c.130 protons, 75 neutrons. Symbol: Re Atomic Number: 75 Atomic Mass: 186.207 amu Melting Point: 3180.0 °C (3453.15 K, 5756.0 °F) Boiling Point: 5627.0 °C (5900.15 K, 10160.6 °F) Number of Protons/Electrons: 75 Number of Neutrons: 111 Classification: Transition Metal Crystal Structure: Hexagonal Density @ 293 K: 21.02 g/cm 3 Color: silverish Atomic Structure The neutron is a subatomic particle, symbol n or n 0, which has a neutral (not positive or negative) charge and a mass slightly greater than that of a proton.Protons and neutrons constitute the nuclei of atoms.Since protons and neutrons behave similarly within the nucleus, and each has a mass of approximately one atomic mass unit, they are both referred to as nucleons. Find the element on the periodic table. This correction represents a, The ratio of the neutron capture cross sections for /sup 186/Os and /sup 187/Os was measured at the 25-keV iron-filtered neutron beam facility of a 10-MW reactor. The atomic mass is the mass of an atom. There are 33 other unstable isotopes recognized, the longest-lived of which are 183Re with a half-life of 70 days, 184Re with a half-life of 38 days, 186Re with a half-life of 3.7186 days, 182Re with a half-life of 64.0 hours, and 189Re with a half-life of 24.3 hours. Neutron physics of the Re/Os clock. Many isotopes have radioactive nuclei, and these isotopes are referred to as radioisotopes. The element with atomic number 75 is Rhenium (Re). Isotopic compositions and standard atomic masses from: Half-life, spin, and isomer data selected from the following sources. Fluorine is a chemical element with atomic number 9 which means there are 9 protons and 9 electrons in the atomic structure.The chemical symbol for Fluorine is F. Atomic Mass of Fluorine. Atomic mass of Fluorine is 18.9984 u.. An almost monoenergetic beam of 30-keV neutrons was produced at the threshold of the {sup 7}Li(p,n){sup 7}Be reaction. The element with atomic number 75 is Rhenium (Re). Review 2000 (IUPAC Technical Report)", "Atomic weights of the elements 2005 (IUPAC Technical Report)", https://en.wikipedia.org/w/index.php?title=Isotopes_of_rhenium&oldid=961405441, Articles to be expanded from October 2019, Creative Commons Attribution-ShareAlike License. But how many electron, neutrons, and protons does it have. Spring shall plant and autumn garner to the end of time." Element Y has 15 protons. 4, 1466-72(Oct 1971). N 100 =N 0. Find the Number of Neutrons Cr. Which among the following represents a set of isotopes? The sum of the masses of the two isotopes is 371.9087 .Find the masses of the individual isotopes. Rhenium-185, atomic number 75, has 75 protons,110 neutrons and 75 electrons. RE: Protons, neutrons, Electrons for rhenium?!?!?!?! b) BNL-325 1) 24.9 0.150.01 0.13003 0.1310.010 0.1310.010 … beta. how many neutrons are in the stable isotope of rhenium 185. The inelastic neutron-scattering cross section of {sup 187}Os has been determined in a time-of-flight experiment at the Karlsruhe 3.7-MV Van de Graaff accelerator. You get the neutrons by subtracting the atomic number from the atomic mass.185 is one of the Isotopes, another is mass 187 . Deuteron fusion: d(d,n) 3He +3.3 MeV , t(d,n) 4He +17.6 MeV 3. O else I fail!!!! "Atomic weights of the elements 2013 (IUPAC Technical Report)", "Atomic weights of the elements. A precise measurement of the neutron’s lifetime is important for calculating the rates at which lighter elements were formed immediately after the Big Bang in a process called nucleosynthesis. # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (, # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (. The 83rd element, bismuth, was traditionally regarded as having the heaviest stable isotope, bismuth-209, but in 2003 researchers in Orsay, France, measured the half-life of 209 Bi to be 1.9 × 10 19 years. How many neutrons make up one - 3459274 31 Y 2-is isoelectronic with which atom below? Both protons and neutrons have spin 1/2, but the direction can be either up or down. HELP!!!!!? Electrostatic repulsions between positively charged protons would normally cause the nuclei of atoms (except H) to fly apart. Of the first 82 elements in the periodic table, 80 have isotopes considered to be stable. The atomic weight of Rhenium (Re) as found on the periodic table of the elements is 186.207. So you know that the atomic number is 75 and the mass number is 186 so subtract those values to get 111 and that will be your neutrons … -decay clock]. (Rhenium-185 is a stable isotope.) Rhenium-185 has in its nucleus. A thermal neutron is a free neutron with a kinetic energy of about 0.025 eV (about 4.0×10 −21 J or 2.4 MJ/kg, hence a speed of 2.19 km/s), which is the most probable energy at a temperature of 290 K (17 °C or 62 °F), the mode of the Maxwell–Boltzmann distribution for this temperature. The atomic weight of Re-185 is 185.0 u, and the atomic weight of Re-187 is 187.0 u. it has 6 protons and 6 neutrons b. it has 12 protons and 12 neutrons c. it has 12 protons and 8 neutrons d. it has 6 protons and 8 neutrons ... What type of emission is likely for Re-188? Naturally occurring rhenium (75 Re) is 37.4% 185 Re, which is stable, and 62.6% 187 Re, which is unstable but has a very long half-life (4.12×10 10 years). Given that 37.1% of natural rhenium is rhenium-185, which is the other stable isotope? Atomic nuclei containing: 20 protons and 20 neutrons; 21 protons and 19 neutrons; 22 neutrons and 18 protons; 20 protons and 22 neutrons; 21 protons and 20 neutrons; How many protons, neutrons, and electrons … Re-185 Isotope Information and Examples of Enriched Re-185 Applications: Rhenium-185 isotope (Re-185 isotope, 185Re isotope). Re-185 is used for the production of Re-186 which is used for bone pain palliation. Number of Protons/Electrons in Rhenium : 75 . Naturally occurring rhenium (75Re) is 37.4% 185Re, which is stable, and 62.6% 187Re, which is unstable but has a very long half-life (4.12×1010 years). What does Rhenium-185 have in its nucleus? Rhenium-185 has in its nucleus Rhenium-185 has in its nucleus A) 75 protons, 75 neutrons. The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. Uranium-235, which is used in nuclear reactors, has 92 protons and 143 neutrons. 185 Re: 186 W 28.43% stable Standard atomic weight A r, standard (W) 183.84(1) Naturally occurring tungsten (74 W) consists of five isotopes. 1 decade ago. Neutron-induced fission: 235 U(n,f) 134 Te+ 99 Zr+3n +185 MeV n th n p γ p How neutrons are born 1. Protons and neutrons each have an intrinsic angular momentum reflected in a quantity called “spin,” which has no classical analog. Uploaded by: fpotoway1. Atomic mass of Fluorine is 18.9984 u.. 37: Atomic Number: Rb: Element Symbol: Rubidium: Element Name: 85.48: Average Atomic Mass: The atomic weight is basically a measurement of the total number of particles in an atom 's nucleus including both protons and neutrons. This page was last edited on 8 June 2020, at 08:25. All atoms of the element potassium have 19 protons. There are many different isotopes of magnesium but: 24Mg is stable with 12 neutrons 25Mg is stable with 13 neutrons 26Mg is stable with 14 neutrons [Re--Os. The element rhenium (RE) exists as two stable isotopes and 18 unstable isotopes. Since the change of spin gives S = +2 we conclude that the S = +7/2 is due to the total S = +3/2 of the extra neutrons. With our resolution of better than 0.4 ns/m we are able to report many resonances beyond 106 eV which were not previously observable. The number of protons is always the same and never changes in an atom of an element. Naturally occurring rhenium is only 37.4% 185 Re, and 62.6% 187 Re, which is unstable but has a very long half-life (≈10 10 years). An isotope, X, of a particular element has an atomic number of 16 and a mass number of 34. Find the Number of Neutrons Rb. There are 45 neutrons in one Selenium atom. And when you're writing nuclear equations, you're representing only the nuclei here, so for example, on the left side of my nuclear equation, I have carbon-14, we're talking about only the nucleus, so we're talking about six protons and eight neutrons in the nucleus. Favorite Answer. Find the element on the periodic table. Stable Isotopes. Relevance. Number of Neutrons Melting Point Boiling Point Date of Discovery Crystal Structure. `8`8'Re NEUTRON RESONANCES 97 TABLE 4 Comparison of measured neutron widths with previously measured values for `8' Re Resonance 2g1(meV) energy (eV) this work Ideno et al.') 24: Atomic Number: Cr: Element Symbol: Chromium: Element Name: 52: Average Atomic Mass: The atomic weight is basically a measurement of the total number of particles in an atom 's nucleus including both protons and neutrons. 5 years ago. 75 protons, 110 neutrons. Rhenium has two isotopes, 185 Re and 187 Re, with an … If the most stable ion of the isotope forms the compound MgX 2, how many neutrons does X have? Rhenium-185 has in its nucleus A) 75 protons, 75 neutrons. 93 protons, 93 neutrons 75 protons, 186 neutrons 75 protons, 75 neutrons 186 protons, 186 neutrons 75 protons, 111 neutrons. "I trust in nature for the stable laws of beauty and utility. The atomic weight of Re-185 is 185.0 u, and the atomic weight of Re-187 is 187.0 u. Mass percent and moles 7. Expert Answer 100% (1 rating) Previous question Next question Get more help from Chegg. ( ) spin value – Indicates spin with weak assignment arguments. B) 75 protons, 130 neutrons. If we consider the mean generation time to be ~0.1s, so the increase from 1000 neutrons the 1105 neutrons occurs within 10 seconds. While neutrons in stable nuclei can exist for an eternity, a free neutron hangs around for about 15 min before it decays via the weak interaction to a proton, an electron and an antineutrino. The atomic mass is the mass of an atom. For example, uranium-238 is the element defined to have 92 protons and 146 neutrons (248 nucleons – 92 protons =146 neutrons). It has two isotopes with mass numbers of 185 and 187. Rev., C 4: No. 2 Answers. o. Re-183 00 Re-187 i. Re-189 e. Re-181 Y. Re-190 t8C.2 . Let x = the atomic weight of Re-185 and (371.9087 - x) = the atomic weight of Re-187. e.not enough information … Rhenium-185 has 75 protons and 110 neutrons in its nucleus while rhenium-187 has 75 protons and 112 neutrons. Which among the following represent a set of isotopes? Recently Asked Questions What can you conclude from th color of the solutions made from the magnesium and calcium oxides when phenolphthalein was added? Atomic nuclei containing This process is called radioactive decay. Information on the inelastic channel is required for reliable calculations of the so-called stellar enhancement factor, by which the laboratory cross section of {sup 187}Os must be corrected in order to account for the thermal population of low-lying excited states at the temperatures of s-process nucleosynthesis, in particular of the important state at 9.75 keV. The number of neutrons isn't listed on the periodic table, but you can use the information on the table... See full answer below. When they decay, they release particles that may be harmful. A value of 0.41 +- 0.04 was obtained. b.75 protons, 130 neutrons. E) not enough information is given.
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