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How many neutrons in rhenium 185

Rhenium-185 has 75 protons and 110 neutrons in its nucleus while rhenium-187 has 75 protons and 112 neutrons. For example, two of the most abundant isotopes are rhenium-185 and rhenium-187. Rhenium-185 has in its nucleus A) 75 protons, 75 neutrons. 10) Cobalt is element 27 Rhenium-185. 14391-28-7. 185Re. Rhenium, isotope of mass 185 (~185~Re)Rheniu Rhenium-185 Isotope Applications: Rhenium-185 isotope (Re-185 isotope, 185Re isotope). Rhenium-185 isotope is used for research in nuclear physics; Rhenium-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) Atomic Number - Protons, Electrons and Neutrons in Rhenium. Rhenium is a chemical element with atomic number 75 which means there are 75 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 Atomic mass is the protons plus a weighted average of neutrons. Rhenium-185 (185Re) has in its nucleus: 75 protons, 110 neutrons 130 protons, 75 neutrons 75 protons, 130 neutrons 75 protons, 75 neutrons Its chemical properties will be exactly like those of U-235 6. It is the total number of protons and neutrons in the atom

how many neutrons are in rhenium 185 - tabloidmaritim

Isotopes of Rhenium. There are 25 radioactive isotopes of rhenium. Rhenium has only one stable isotope, rhenium-185. Rhenium-185 is quite rare, as natural rhenium contain about 37.4 % of rhemium-185 and about 62.6% of rhenium-187. Rhenium-187 is not highly unstable as it has a half-life of about 10 10 years. REFERENCES [1] Rhenium is element 75 in the periodic table and in many ways a rather unusual element. Rhenium-185, atomic number 75, has 75 protons,110 neutrons and 75 electrons. b.75 protons, 130 neutrons. Meghan Markle Joe Giuliano Married, Alkali Metals 185 Re 187 Re. Course Navigator Both Rhenium isotopes are used for medical purposes The element rhenium (Re) does exist as two stable isotopes and 18 unstable isotopes. Rhenium-185 has in its nucleus how many protons and neutrons? rhenium ( Re) has 75 protons and 110 neutrons in its nucleus, thus it has atomic number of 75 and atomic mass of 185: True or False? The mass of an alpha particle is 7300 times that of the electron. TRU

Rhenium-185 Re - PubChe

There are _____ neutrons in the stable isotope of rhenium (Re-185). 110. You will need to obtain a periodic table. One isotope of copper is written as copper-63. the mass can indicate how many neutrons are in an isotope. FALSE. Atoms of the same element can have a different number of neutrons. TRUE. There are three naturally-occurring. The element with atomic number 75 is Rhenium (Re). It has two isotopes with mass numbers of 185 and 187. Number of Protons/Electrons in Rhenium : 75 . Number of Neutrons in Rhenium : 110 or 112. 3. Sulfur with atomic number 16, mass number 32 and a two negative charge has how many protons, neutrons and electrons? 4. Rhenium-185 has in its nucleus how many protons and neutrons? 5. Write formulas for the sulfide ion, ammonium chloride, acetic acid, and barium oxide. 6 The number of protons determines the element, but the number of neutrons in the atom of any one element can vary. Each variation is an isotope. Rhenium-187 is radioactive. A radioactive isotope is one that breaks apart and gives off some form of radiation. The half life of rhenium-187 is about 100,000,000 years

For each of the isotopes of lead, how many protons, neutrons, and electrons are in each? Given the weighted average atomic mass of rhenium (186.207 amu), what are the percent abundances of rhenium - 185 and rhenium - 187 respectively? Calculate the number of atoms of rhenium - 187 in a 5.61 gram sample Tungsten-186 Isotope Applications: Tungsten-186 isotope (W-186 isotope, 186W isotope). Tungsten-186 isotope is used for Rhenium-188 (Re-188 isotope, 188Re isotope) radionuclide (radioisotope) production (can be used in life science for healthcare and medical applications and pharmaceuticals industries) Source: Rhenium is not found free in nature but is found in small quantities in platinum and molybdenum ores and many minerals. Commercially, rhenium is recovered as a by-product of copper refining. Isotopes: Rhenium has 33 isotopes whose half-lives are known, with mass numbers from 160 to 192

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 (Rhenium-185 is a stable isotope.) Rhenium-188 is a radioisotope for treatment of cancer. a. α d. γray b. β e. X-ray c. positron 35 Mass numbers of typical isotopes of Rhenium are 185, 187. 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 Atoms of the same element with different numbers of neutrons. 185 Re 184.953 37.4 Well there are many of them. A good deal of the rhenium extracted is made into super-alloys to be used for parts in jet engines. Not surprisingly for a transition metal, rhenium is also a good catalyst.. The thermal neutron activation cross sections of Re/sup 185/ and Re/sup 187/ were measured and found to be 96.5 plus or minus 10 and 88 plus or minus 14 b, respectively. The effective resonance integral of natural rhenium was measured to be 694 plus or minus 28 b including the 1/v component The effective resonance integral of natural rhenium was measured to be 694 28 barns in cluding the 1v component. The n, 2n cross sections of Re-185, Re- 187, and Re-185 n, 2n Re-184m with 14.1 Mev neutrons were found to be 1.91 0.6 barns, 1.44 0.41 barns and 1.12 0.4 barns, respectively

If we were to look at a possible (n, 2n) reaction of the 185 Re, we would find the difference in binding energies between the rhenium-184 (184 Re) product and the initial 185 Re to be -7.8 MeV. Here, the negative sign indicates that the reaction would not occur with thermal neutrons; in fact, more than 7.8 MeV of energy would have to be provided 8. The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. Rhenium-185 has in its nucleus a. 75 protons, 110 neutrons. b. 75 protons, 75 neutrons. c. 75 protons, 130 neutrons. d. 130 protons, 75 neutrons. e. not enough information is given. ANSWER: a POINTS: 1 DIFFICULTY: easy TOPICS: 2. Vials containing 20 mg of 30% rhenium microspheres were neutron-activated for 1 h at 5×10 12 n/cm 2 /s, yielding 185 MBq of 186/188 Re on the following day. At that time, aliquots of the rhenium microspheres were suspended in 50 mM PBS or fetal bovine serum 50% and sonicated briefly in a bath sonicator (Branson, Danbury, CT) 21) The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. Rhenium-185 (185Re) has in its nucleus: A) 75 protons, 75 neutrons . B) 75 protons, 130 neutrons . C) 130 protons, 75 neutrons . D) 75 protons, 110 neutrons . Answer: D . Diff: 1 . Section: 2-3 . Global: G2 . LO: 2. Rhenium-188 (188Re) is a high energy beta-emitting radioisotope with a short 16.9 h physical half-life, which has been shown to be a very attractive candidate for use in therapeutic nuclear medicine. The high beta emission has an average energy of 784 keV and a maximum energy of 2.12 MeV, sufficient to penetrate and destroy targeted abnormal tissues. In addition, the low-abundant gamma.

Rhenium 185 is stable but Rhenium 186 is unstable as it has an extra proton which makes too many of them compared to the amount of neutrons. There are many unstable isotopes of Rhenium but Rhenium 185 is the only stable isotope Thermocouples containing alloys of rhenium and tungsten are used to measure temperatures up to 2200°C. Rhenium wire is used in photoflash lamps in photography; Isotope. Naturally occurring rhenium is a mix of 185 Re, which is stable, 187 Re, which is unstable but has a very long half-life. There are thirty-four unstable isotopes recognized The core of rhenium, the Re-150, with 75 protons and 75 neutrons (odd number) breaks the high symmetry giving only one stable isotope. In general since the additional p75n75 is a vertical system with S =0, the structure of Re-150 has S =0 with six horizontal planes of opposite spins . Moreover two horizontal squares like the -HSQ and +HSQ exist. The Element Rhenium - Known Isotopes. Most of the isotope data on this site has been obtained from the National Nuclear Data Center.Please visit their site for more information.. Isotopes With A Known Natural Abundanc Rhenium-185 has 75 protons and 110 neutrons in its nucleus while rhenium-187 has 75 protons and 112 neutrons. Two radioactive isotopes, rhenium-186 and rhenium-188, are used to treat some liver.

Rhenium-185, Rhenium-185 Isotope, Enriched Rhenium-18

5. The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. Rhenium-185 has in its nucleus [A] 75 protons, 75 neutrons. [B] not enough information is given. [C] 130 protons, 75 neutrons. [D] 75 protons, 130 neutrons. [E] 75 protons, 110 neutrons 6.) What is in the nucleus of Rhenium­185? (75 protons, 110 neutrons) 7.) An isotope, X, of a particular element has an atomic number of 16 and a mass number of 34. What is the name of element X? (Sulfur­34) 8.) Complete the following table. Symbol # Protons # Neutrons # Electrons Net Charge 206P There are two naturally occurring isotopes of rhenium: Re-187 and Re-185. Which isotope is the most abundant? Re-187 is more abundant, as the average atomic mass of rhenium on the periodic table is 186.21 amu. As the average atomic mass of rhenium is closer to 187 than it is to 185, the natural abundance of Re-187 must be greater Rhenium Properties. Rhenium is a Block D, Group 7, Period 6 element. The number of electrons in each of rhenium's shells is 2, 8, 18, 32, 13, 2 and its electron configuration is [Xe] 4f 14 5d 5 6s 2. after the area where Tacke was born. General Properties

When rhenium target nuclides, t Re, are bombarded with neutrons in accordance with the preferred process of the invention, the neutrons are captured by the rhenium nuclides and gamma energy is released to form a rhenium product nuclide, p Re, where p is 186 when t is 185 and p is 188 when t is 186 35 protons,44 neutrons, 35 electrons The atomic mass of rhenium is 186.2 .Given that 37.1% of natural rhenium is rhenium-185, what is the other stable isotope of the element rhenium? 189^(Re)75 where the 189 is superscripted and the 75 is subscripted Rhenium is a very rare material that does not exist in nature as a free element. It is extremely dense, has a high melting point, and has the highest boiling point of any element. Natural rhenium consists of 185Re with a 37.40% abundance and 187Re, a long-lived isotope with half-life of 4.12×1010 years and a 62.60% abundance. Rhenium is

Rhenium is an extremely rare material that does not occur as a free element in nature. It is extremely dense, has a high melting point, and the highest boiling point of any element (Weast et al., 1987). Natural rhenium consists of one stable isotope, 185Re (37.40% abundance) and one long-lived isotope, 187Re (62.60 Q. The average atomic mass rhenium, Re, is 186.21 amu. If 37.1% of rhenium has mass# = 185, what is the other stable isotope A rare earth metal, rhenium (pronounced as REE-nee-em) belongs to the family of transition metals denoted by the chemical symbol Re [1]. It has 33 isotopes with known half-lives, their mass numbers ranging from 160 to 192. Naturally occurring rhenium is a mixture of a stable isotope, Rhenium-185 and a radioactive isotope, Rhenium-187 [2, 9] OSTI.GOV Journal Article: Study of the reaction /sup 185/Re(n,. gamma. )/sup 186/Re in isolated resonance The principal ores of rhenium are molybdenite, gadolinite, and columbite. Rhenium is one of the rarest elements in the world. Its abundance is thought to be about one part per billion. Isotopes. Two isotopes of rhenium occur in nature, rhenium-185 and rhenium-187. Isotopes are two or more forms of an element

The atomic mass of rhenium is 186.2 amu. Given that 37.1% of natural rhenium is rhenium-185, what is the other stable isotope? A. 183 Re B. 187 Re C. 189 Re D. 181 Re E. 190 Re 6. A metal M forms an oxide M 2 O 3 that contains 68.4% of the metal by mass. Calculate the molar mass of the metal tungsten protons and neutrons Home. 2021. February. 27. tungsten protons and neutrons. February 27, 2021 News. For most of our reactions, we apply 0.5 or 0.6 volts, so that the three sulfides are together reduced to metallic, rhenium, molybdenum and copper, Sahu explains Rhenium-185, atomic number 75, has 75 protons,110 neutrons and 75 electrons

Rubidium Sulfate (Rb 2 SO 4) Interesting facts. It is the 16th most common element in the earth's crust. It is found in North America, Rush and South Africa. It can also be found in seawater and in mineral springs. It is not found freely in nature. It reacts strongly in water and bursts into flames when exposed to air Move to Rhenium. Move to Iridium > Osmium Atoms of the same element with different numbers of neutrons. CAS number 185.954 1.59 2 x 10 15 y α 187 Os 186.956 1.96 -. There are many isotopes of calcium, ranging from calcium-40 with 20 neutrons, to calcium-48 with 28 neutrons. Comprehensive data on the chemical element Tantalum is provided on this page; including scores of properties, element names in many languages, most known nuclides of Tantalum. $_ {9}^ {19}\mathrm {F}$ b

Rhenium - Periodic Table and Atomic Propertie

  1. 4) number of neutrons. 10) The atomic mass of rhenium is 186.2. Given that 37.1% of natural rhenium is rhenium -185, what is the other stable isotope? 187Re. 11) Which element contains atoms that have an average mass of 5.14 x10-23 grams? MW 30.9428 phosphorus. 12) Which member of each pair has a greater mass? Explai
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  3. eral called osmiridium, which is very rare. It is also a byproduct of refining nickel ores
  4. 8. The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. Rhenium-185 has in its nucleus A) 75 protons, 75 neutrons. B) 75 protons, 130 neutrons. C) 130 protons, 75 neutrons. D) 75 protons, 110 neutrons. E) not enough information is given. 9. 2040 Ca2 has A) 20 protons, 20 neutrons, and 18 electrons
  5. The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. Rhenium-185 has in its nucleus A) 75 protons, 75 neutrons B) 75 protons, 130 neutrons How many protons, neutrons and electrons, in that order are present in the anion formed by one atom of 79Se? A) 34, 34, 45 D) 34, 45, 36.

how many protons and neutrons are in yttrium

  1. Stable even-even nuclides number as many as three isobars for some mass numbers, and up to seven isotopes for some atomic numbers. Conversely, of the 252 known stable nuclides, only five have both an odd number of protons and odd number of neutrons: hydrogen-2 , lithium-6, boron-10, nitrogen-14, and tantalum-180m
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  3. 185 Re 37.4% 185 Re is stable with 110 neutrons. 187 Re 62.6% 4.35x10 10 y α (not observed) 1.653 183 Ta 187 Re 62.6% 4.35x10 10 y β- 0.0026 187 Os Rhenium has many common compounds that are split into groups of fluorides, chlorides, bromides, iodides, oxides, sulfides, tellurides, and carbonyls and are listed below..
  4. 11.The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. Rhenium-185 has in its nucleus a) 75 protons, 75 neutrons b) 75 protons, 130 neutrons c) 130 protons, 75 neutrons d) 75 protons, 110 neutrons e) not enough information 12. Which of the.
  5. 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 (Rhenium-185 is a stable isotope.) Rhenium-188 is a radioisotope for treatment of cancer. a. γα d. ray b. β e. X-ray c. positron 35
  6. 75 Rhenium 185 Re 184.952956 37.40 187 Re 186.955751 62.60 76 Osmium 184 Os 183.952491 0.02 186 Os 185.953838 1.59 187 Os 186.955748 1.96 188 Os 187.955836 13.24 189 Os 188.958145 16.15 190 Os 189.958445 26.26 192 Os 191.961479 40.78 Z Name Symbol Mass of Atom (u) %.

Thin-film and powdered 185 or 187 Re o metal targets, and 185 or 187 Re oxide/metal oxide target compositions with rhenium in a lower, relatively reduced oxidation state are prepared. The thin-film rhenium targets are aged for at least about 24 hours and then irradiated with neutrons in the present of an oxidizing medium sufficient to form a. The Re-188 yields after elution are generally 75% to 80% of the available Re-188. The generator reaches the 62% of the equilibrium after 24 hours; therefore, the daily elution will provide approximately 50% of the Re-188 that would be available at equilibrium, adjusting the availability of Re-188 for the preparation of therapeutic agents in a daily basis 24. The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. Rhenium-185 has in its nucleus A) 75 protons, 75 neutrons B) 75 protons, 130 neutrons C) 130 protons, 75 neutrons D) 75 protons, 110 neutrons E) not enough information ANS: D PTS: 1 DIF: Easy REF: 2.

Video: Chemical Elements.com - Rhenium (Re

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How many protons are in Rhenium the element? - Answer

Rhenium Re (Element 75) of Periodic Table. It is a silvery white metal with a metallic luster, it is rarely seen as such on account of its high melting point, which is the 3rd highest after tungsten (3422 oC) & carbon (3550 oC). Rhenium is very hard, and it resists corrosion but slowly tarnishes in moist air, and the annealed rhenium is very. 8. The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. Rhenium-185 has in its nucleus A) 75 protons, 110 neutrons. B) 75 protons, 75 neutrons. C) 75 protons, 130 neutrons. D) 130 protons, 75 neutrons. E) not enough information is given. ANS: A PTS: 1 DIF: easy TOP: 2. 18) The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. Rhenium-185 has in its nucleus 18) A) 75 protons, 110 neutrons B) 75 protons, 75 neutrons C) 75 protons, 130 neutrons. D) 130 protons, 75 neutrons. 19) An ion is formed I. by either adding protons to or subtracting protons from the atom The element rhenium consists of two isotopes 185 Re and 187 Re, in the atomic ratio of 2:3. Calculate the relative atomic mass of rhenium to three significant figures. Suggested Answer: Relative Atomic Mass, Ar = [(2 X 185) + ( 3 X 187)] / (2 + 3) = 186 (3 sig fig

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Isotopes of rhenium - Wikipedi

8. The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. Rhenium-185 has in its nucleus . A) 75 protons, 75 neutrons. B) 75 protons, 130 neutrons. C) 130 protons, 75 neutrons. D) 75 protons, 110 neutrons. E) not enough information is given. 9. has . A) 20 protons, 20 neutrons, and 18 electrons Rhenium-185 (185Re) has in its nucleus: A) 75 protons, 75 neutrons B) 75 protons, 130 neutrons C) 130 protons, 75 neutrons D) 75 protons, 110 neutrons Answer: D Diff: 1 Section: 2-3 19) The masses.

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The atomic mass of rhenium is 186

SINGH et al.: EXCITATION FUNCTIONS OF (n,p) and (n,2n) REACTIONS 315 3 Nuclear Reaction Model Calculations TALYS-1.9 TALYS-1.97 is a computer code system for the analysis and prediction of nuclear reactions. The main purpose of the TALYS is the simulation o 18) The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. Rhenium-185 (185Re) has in its nucleus: A) 75 protons, 75 neutrons B) 75 protons, 130 neutrons C) 130 protons, 75 neutrons D) 75 protons, 110 neutrons Answer: D Diff: 1 Section: 2-3 19) The masses on the periodic table are expressed in what units? A) Gram The element rhenium (Re) has two naturally occurring isotopes, 185 Re and 187 Re, with an average atomic mass of 186.207 amu. Rhenium is 62.60% 187 Re, with an atomic mass of 186.956 amu. Calculate the atomic mass of 185 Re. What is the average atomic mass for thallium, Tl? The two stable isotopes; Tl-205 has a mass o Reactor production of 131 I is generally via irradiation of 130 Te via the 130 Te (n, γ) 131 Te ( t ½ = 25 min) and 130 Te (n, γ) 131m Te ( t ½ = 30 h) nuclear reactions, which have thermal-neutron capture cross sections of 0.2 and 0.04 barn, respectively, and the three decay branches are shown in Figs. 5.4 and 5.5 In nature rhenium is found as two isotopes 37.40% 185Re and 62.60% 187Re. Assume the 185 and 187 are exact and find to (4 significant figures) the average mass of rhenium. 843 185 2) What are the number of protons and number of neutrons in Re ? 3) What are the number of protons and electrons in 187Re2+

The element rhenium (Re) exists as two stable isotopes and

How many neutrons are found in 12C? 13C? 13C-?3. How many electrons are found in 12C? 13C? 13C-?4. a) What feature distinguishes a neutral atom from an ion? The atomic mass of rhenium is 186.2. Given that 37.1% of natural rhenium is rhenium-185, what is the other stable isotope Question The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. Rhenium-185 has in its nucleus Answer A.€ 75 protons, 75 neutrons. B.€ 75 protons, 130 neutrons. C.€ 130 protons, 75 neutrons. D.€ 75 protons, 110 neutrons. E.€ not enough information is given. Add Question Here Question 9 Multiple Choice 1.

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Rhenium History, Uses, Facts, Physical & Chemical

7. Rhenium has two isotopes, 185Re and 187Re, with an average atomic mass of 186.207 amu. If Rhenium is 62.60% 187Re, and the atomic mass of 187Re is 186.956 amu, what is the mass of 185Re The W-188/Re-188 Generator W-188 Production.Re-188 is carrier free as Na 188 Re O 4 obtained from a W-188/Re-188 alumina based generator. Parent radionuclide, tungsten-188 (W-188) with a half life equal to 69.4 d, is produced in a nuclear reactor by irradiation of tungsten oxide, 96.07% enrichment in tungsten-188 (W-188) with thermal and high energy neutrons Adaugat pe februarie 27, 202

how many neutrons are in rhenium - laspalmasbr

Almost all of the mass of the atom is concentrated in the nucleus. The protons and neutrons in the nucleus The atomic mass of rhenium ht 186 .2JGiven that 37. 1% of natural rhenium is rhenium- 185, what is Lindane, a powerful \5. The empirica\ formu\aofa gr?up of coTmhpo \ar mass of\indane is 290.8. How many \ insecticide is a member of. many grams of hydrogen are there in a 185-g sample of the substance? a. 9.34 g d. 5.05 g b. 18.7 g e. 36.6 g c. 10.6 g 19. A chloride of rhenium contains 63.6% rhenium. What is the formula of this compound? a. ReCl d. ReCl7 b. ReCl3 e. Re2Cl3 c. ReCl5 20. The average mass of a magnesium atom is 24.31. Assuming you were able to pick u A radiotheraputical source of Rhenium 188 comprises metallic Tungsten 188 or a metal oxide of Tungsten 188 . Therapeutic device using Rhenium 188 comprise a radioactive source for the in situ generation of Rhenium 188 from Tungsten 188

Quia - Chemistry II, Zumdahl 7th edit, Chapter#2 Questions

let's look at three types of radioactive decay and we'll start with alpha decay so in alpha decay an alpha particle is ejected from an unstable nucleus and so here's our unstable nucleus so uranium 238 an alpha particle has the same composition as a helium nucleus so we saw the helium nucleus in the previous video right there are two protons in the helium nucleus and two neutrons so I go ahead. Q: The atomic mass of rhenium is 186.2. Given that 37.1% of natural rhenium is rhenium-185, what is the... A: Average atomic mass = ∑i=1n (mass of ith isotope)(% abundance of ith isotope)100 Where n re.. When rhenium target nuclides, t Re, are bombarded with neutrons in accordance with the preferred process of the invention, the neutrons are captured by the rhenium nuclides and gamma energy is released to form a rhenium product nuclide, p Re, where p is 186 when t is 185 and p is 188 when t is 186 Isotopic atomic species¶. Note that isotopic atomic species of a given element is uniquely identified by the mass number A, also called atomic mass number, which is the number of nucleons (protons and neutrons) in an atomic nucleus.The full isotope symbol would also have the atomic number Z as a subscript to the left of the element symbol directly below the mass number: {}_{6}^{12}\mathrm{C}

Ch 2 quiz Flashcards Quizle

Number of isotopes (atoms of the same element with a different number of neutrons): 32 whose half-lives are known with mass numbers 154 to 185 Most common isotopes: Hf-174, Hf-176, Hf-177, Hf-178. 7. Rhenium has two isotopes, 185Re and 187Re, with an average atomic mass of 186.207 amu. If Rhenium is 62.60% 187Re, and the atomic mass of 187Re is 186.956 amu, what is the mass of 185Re? a) 184.953 amu b) 185.000 amu c) 185.047 amu d) 185.458 amu. 8. Fungal laccase is 0.390 % Cu by mass Chapter 2: Atoms, Molecules, and Ions 1. According to the law of definite proportions, A) the ratio of the masses of the elements in a compound is always the same. B) it is not possible for the. 19. The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. Rhenium-185 has in its nucleus A) 75 protons, 75 neutrons. B) 75 protons, 130 neutrons. C) 130 protons, 75 neutrons. D) 75 protons, 110 neutrons. E) not enough information is given. 20. Which statement is not correct

185, Re and : 187: Re. The Re. The relative atomic mass of rhenium is 186.2. From this information, the percentage abundances of these two isotopes are: A : 12% : 185: Re and 88% : 187: Re: B : 40% : 185: Re and 60% : 187: Re: C : 60% : 185: Re and 40% : 187: Re: D : 88% : 185: Re and 12% 13 A model of the atom describes a nucleus. The percentage of abundance and isotopic mass is used to calculate the average isotopic mass. For example, two isotopes of Nitrogen are N-14 and N-15 and average isotopic mass of Nitrogen is 14.007. The percentage abundance of both isotopes can be calculated as given below. (14.003074) (x) + (15.000108) (1 - x) = 14.007 Many important properties of an isotope depend on its mass. The total number of neutrons and protons (symbol A), or mass number, rhenium 75 Re 185 37.398 −43.821 187 62.602 −41.218 osmium 76 Os 184 0.0197 −44.254 186 1.5859 −42.999. a. 49protons, 63 neutrons, electrons. b. 49 protons, neutrons. c. 49protons, alpha particles. d. 49 protons, 63 neutrons. e. 49 protons, 112 neutrons. ANSWER: d POINTS: 1 2. A hypothetical element consists of two isotopes of masses 78.95 amu and 80.95 amu with abundances of 32.9% and 67.1%, respectively. What is the average atomic mass of this. 3. The element rhenium (Re) exists as two stable isotopes and 18 unstable isotopes. Rhenium-185 has in its nucleus A) 75 protons, 75 neutrons. B) 75 protons, 130 neutrons. C) 130 protons, 75 neutrons. D) 75 protons, 110 neutrons. E) not enough information is given. 4. The numbers of protons, neutrons, and electrons in are: A) 52 p, 128 n, 53