1 Both substances are compounds. ³⁵Cl₁₇ is found by 75 % and ³⁷Cl₁₇ is found by 25 % by a ratio 3:1. soobee72pl found this answer helpful. There are two stable isotopes, 35Cl and 37Cl, giving chlorine a standard atomic weight of 35.45. They have the same atomic number. Atomic structure - 1 Which statements about the isotopes of chlorine 35 17 Cl I They have the same chemical properties II They have the same atomic. For example, the relative atomic mass of chlorine is 35.5 rather than a whole number. a. 51.83% of the atoms have a mass of 106.90509 u, and the remaining fraction has a mass of 108.9047u. A. They have the same physical properties. Which statements about the chlorine free radical are correct? c. It is a weighted average, so common isotopes have a … The whole mass of an atom is concentrated in the nucleus ii. Español. 19 22 19 41. Which statement about the isotopes of nitrogen is correct? Isotopes of an element vary in mass because of differing numbers of . Let’s use x to represent the number of Cl-35 atoms. A.  ... What is the relative atomic mass of an element with the following mass spectrum? Q. English 5 Chlorine exists as two common isotopes, 35Cl and 37Cl. They have the same physical properties. 35 37 A. I and II only B. I and III only C. II and III only D. I, II and III (Total 1 mark) 2. The atom is an indivisible particle iii. The longest-lived radioactive isotope is 36Cl, which has a half-life of 301,000 years. … Answer Answer: (b) Q.7. 4.Some elements have 3 or more naturally occurring isotopes. II. b. Calculate the relative atomic mass of this sample of magnesium correct to two decimal places. The atom as a whole is neutral iv. Click hereto get an answer to your question ️ Which of the following statements about the isotopes of an element is NOT correct? Answer: The most abundant isotope is ³⁵Cl₁₇. As you may know, chlorine's relative atomic massis 35.5, but it has two significantly occurring isotopes: chlorine-35 and chlorine-37. B Bromide ions are oxidised when electrons are lost. Solved: There are two stable isotopes of chlorine: chlorine-35, with a mass of 34.968853 amu; and chlorine-37, with a mass of 36.965903. 1^H, 2^H, and 3^H are all isotopes of hydrogen. Which is an isotope of 24Mg? A.    14N, 16O,... Mass spectroscopic analysis of a sample of magnesium gave the following results: number of protons number of neutrons number of electron shells 35Cl 17 18 3 37Cl 17 20 3 Which statement explains why the two isotopes are of the same element? Which of the following statements about isotopes is/are correct? Calculate the... Isotopes of boron containing 7 and 8 neutrons also exist. Which statements about the chlorine free radical are correct? 19. Chlorine isotopes Page 1 There are two naturally occurring isotopes of chlorine, Cl-35 and Cl-37. They have the same number of protons and electrons. What property of an element determines its chemical behaviour? A.  ... A sample of silicon contains three isotopes. answer choices . Which statement about the isotopes of nitrogen is correct? B) The atomic mass of chlorine will be more than 37. Calculate the percentage of each isotope in pure rubidium. They have the same number of protons and electrons, but a different number of neutrons. We have Provided Structure of the Atom Class 9 Science MCQs Questions with Answers to help students understand the concept very well. The relative atomic mass of copper is 63.55. III. I. Chlorine is a chemical element with atomic number 17 and an atomic weight of 35.4527 grams per mole. b. n = 3 → n = 2. What is the relative atomic mass of the... Deduce the missing information and complete the following table. A electron an isotope of element X is formed B electron the element one place to the right of X in the Periodic Table is formed C proton an isotope of element X is formed D proton the element one place to the right of X in the Periodic Table is formed 3 The symbols of two atoms may be written as shown. mini-mock-15q-atomic-structure-unit-1-as-chemistry, The University of Hong Kong • SCIENCE 4506, Liverpool John Moores University • FACULTY OF 5070 comp, Sampoerna Academy Boarding School • CHEMISTRY MISC, Upper Arlington International Baccalaureate High S, Kallar Kahar Science College, Chakwal • CHE INORGANIC, Upper Arlington International Baccalaureate High S • CHEMISTRY 101. Course Hero is not sponsored or endorsed by any college or university. They have the same chemical properties. 5.Isotopes of the same element have the same … 30 seconds . 13M.2.sl.TZ1.6a.ii: Calculate the percentage abundance of each isotope, given that the relative atomic mass of B... 13M.1.sl.TZ2.6: Which is an isotope of 24Mg? Cl 2 + 2Br – → 2Cl – + Br 2 Which statement about this reaction is correct? A.   \(^{16}{{\text{O}}^ +... State the relative mass and charge of the subatomic particles of an atom. A. I and II only. I. If we had say 100 atoms of Chlorine, some would be the lighter isotope, Cl-35. Statement 2: Alloys are made by mixing molten metals together and allowing them to cool. b. The fact that LiBr is 7.99 % lithium and 92.01 % bromine by mass regardless of its origin is an example of _____. The different types of chlorine are called isotopes . Which of the following statements is correct. The ionic equation for the reaction is shown. In the emission spectrum of hydrogen, which electronic transition would produce a line in the visible region of the electromagnetic spectrum? Which statement is not correct in case of isotopes of chlorine 17Cl35 and 17Cl37 SURVEY . A. I and II only B. I and III only C. II and III only D. I, II and III 18. It has a single unpaired electron. 18 Chlorine displaces bromine from aqueous potassium bromide. The melting point and boiling point of different isotopes of the same element will vary greatly. What are the numbers of neutrons and electrons in the iodine ion,... Outline why there are molecules with different molar masses. C chlorine 71 D hydrogen 2 2 The diagrams show liquids in a burette and a measuring cylinder. It is equal to one-twelfth the mass of the most common isotope. They have different physical properties. Which of the two will be chemically more reactive, Sulphur(S) with atomic number 16 or Chlorine (Cl) with atomic number 17? A€€€€€€€The first ionisation energy of iron is greater than its second ionisation energy. It has 18 electrons. Neutrons. C Y and Z are isotopes of elements in the same period of the Periodic Table. The isotopes of an element have the same number of protons, but different numbers of neutrons. This is because chlorine contains two different isotopes, chlorine-35 and chlorine-37. A.   An ion with 12 protons and 24... State the number of protons, neutrons and electrons in the \({}_{22}^{48}{\text{Ti}}\) atom. B X and Y are isotopes of elements in the same group of the Periodic Table. A sample of magnesium has the following isotopic composition. B Both statements are correct but statement 2 does not explain statement 1. The table shows the nucleon number and the number of neutrons in one atom of isotopes W, X, Y and Z. They have the same chemical properties. A.   ... What does \(_{{\text{24}}}^{{\text{52}}}{\text{X}}\) represent? State your answers to three... State the number of neutrons present in an atom of \(^{{\text{121}}}{\text{Sb}}\). What is the number of protons and the number of neutrons in 131I? 3 Silicon(IV) oxide is bonded ionically. Which statement about the isotopes of nitrogen is correct? 9. Which statement about an element’s average atomic mass is correct? D. I, II and III. All other isotopes have half-lives under 1 hour, many less than one second. Cl 2 + 2Br – → 2Cl – + Br 2 Which statement about this reaction is correct? MCQ Questions for Class 9 Science with Answers were prepared based on the latest exam pattern. The reaction is exothermic. A.   They have the same mass... A sample of iron has the following isotopic composition by mass. 18 Chlorine displaces bromine from aqueous potassium bromide. The relative atomic mass of boron is 10.8, to three significant figures. (b) A neutron is formed by an electron and a proton combining together. The relative atomic mass of naturally occurring copper is 63.55. Given that the average atomic mass of a chlorine atom is 35.45 amu, which of the following statements is true? They have the same number of protons and electrons. A [1] 3. This preview shows page 1 - 3 out of 7 pages. Which statements about the isotopes of chlorine. In which group of the periodic table would the unknown element be found. Which of the following correctly lists the elements sodium, silicon, and chlorine in order of decreasing first ionization energy? All the atoms are stable in their basic state Choose the right option among the following: (a) (i) and (iii) (b) only (ii) 52 X 23 5224Y Which statement about these atoms is correct? A) Isotopes of the same element don't usually have the same properties. A 1 and 2 B 2 and 3 C 2 and 4 D 3 and 4 7 Which statement about metals is correct? burette measuring cylinder A 27.8 42 B 27.8 44 C 28.2 42 D 28.2 44 Which ion will show the least deflection in a mass spectrometer? Titanium exists as several isotopes. III. They have the same... 13M.2.sl.TZ1.6a.i: Define the term isotopes of an element. Naturally occurring silver is composed of two stable isotopes, 107Ag and 109Ag. It is an uncharged species. In the emission spectrum of hydrogen, which electronic transition would produce a line in the. It is formed by homolytic fission. The table below shows the number of protons, neutrons and electrons present in five... What is the atomic number of a neutral atom which has 51 neutrons and 40 electrons? 4 Both substances have very high melting points. A Both have the same number of electron shells. The nuclear symbol of an isotope of potassium is 41 K 19. (c) The mass of an electron is about 2 0 0 0 1 times that of the proton. C) Isotopes of the same element differ only in the number of electrons they contain. D Z has a higher proton number than Y. There are two stable isotopes of chlorine: chlorine-35, with a mass of 34.968853 amu; and chlorine-37, with a mass of 36.965903. Therefore, it is neutral. Tags: Question 3 . They have the same chemical properties. The reaction is endothermic. Predict the relative atomic radii of the three magnesium isotopes, giving your reasons. Calculate the percentage of each isotope in pure antimony. 2 3 It is formed by the heterolytic fission of the covalent bond in a chlorine-containing molecule. Which quantities are the same for all atoms of chlorine? The reaction produces a gas. Which statements are correct? III. A. I and II only B. I and III only C. II and III only D. I, II and III 18. (b) Isotopes are the atoms of different elements 7. Determine the number of neutrons in one atom of iodine-131. Which of the following statements about isotopes is TRUE? Calculate the abundances of... How many electrons does the ion \(_{{\text{15}}}^{{\text{31}}}{{\text{P}}^{3 - }}\)... How many protons, neutrons and electrons are present in each atom of... Strontium exists as four naturally-occurring isotopes. Which statement about W, X, Y and Z is correct? Which of the following statements is incorrect about the structure of an atom? Which of the following statements is true? law of definite proportions. (a) J.J.Thomson proposed that the nucleus of an atom contains only nucleons. C Chlorine acts as a … B X and Y are isotopes of elements in the same group of the Periodic Table. Information about these two isotopes is shown. Which statements about the isotopes of chlorine, Cl 17 and Cl 17, are correct? (a) Size of an element (b) Valency of an element (c) Molar mass of the element (d) None of these. A W and X are isotopes of the same element. It is determined by counting the number of isotopes in a sample of the element. Which one of the following statements is not correct? An isotope is identified by its mass number. International Baccalaureate® - Baccalauréat International® - Bachillerato Internacional®. They have different physical properties. 13M.1.sl.TZ1.6: Which statements about the isotopes of an element are correct? They have the same chemical properties. Choose the correct option from the following: (a) Only (iii) (b) Both (i) & (iii) (c) Only (i) (d) Both (ii) & (iv) Answer Answer: (b) Q.6. A) The atomic mass of chlorine will be less than 35. Consider the relative abundance of the isotopes of element X. Which statements are true for an SN2 reaction? Which of the following statements is true? 3.Isotopes of the same element don't usually have the same properties. So although chlorine has a mass number of 35 which means it has 18 neutrons, it can also have a mass number of 37, which means it has 20 neutrons. Since the average atomic mass of Cl is 35.45 g/mole, so the most abundant one is that one near this number, ³⁵Cl₁₇. 8 The relative atomic mass of chlorine is 35.5. © International Baccalaureate Organization 2018 II. i. A Bromide ions act as an oxidising agent. Which of the following statements about isotopes is incorrect? Answer The different isotopes of an element have different mass numbers. The ionic equation for the reaction is shown. Which ion will be deflected most in a mass spectrometer? I. C Y and Z are isotopes … Which statement is correct about chlorine-35 and chorine-37? User interface language: I. C. II and III only. Which species would be deflected most in a mass spectrometer? It is formed by homolytic fission. II. Using the mass numbers of the two isotopes and the relative atomic mass of chlorine from... What is the correct number of each particle in an oxygen ion,... (i)   Define the terms atomic number, mass number and isotopes of an element. Which statement is correct for the ion \(_4^9{\text{B}}{{\text{e}}^{2 + }}\)? Start studying Chapter 2. I. A. Cl > Si > Na Two natural isotopes exist for silver. 1.An isotope of an atom with a larger number of neutrons is larger than an isotope of the same atom that contains fewer neutrons. B. I and III only. Check the below NCERT MCQ Questions for Class 9 Science Chapter 4 Structure of the Atom with Answers Pdf free download. B) An isotope of an atom with a larger number of neutrons is larger than an isotope of the same atom that contains fewer neutrons. Which statements about the isotopes of chlorine, and , are correct? Which statements about the isotopes of an element are correct? 2.Isotopes of the same element differ only in the number of electrons they contain. Which statement about the numbers of protons, electrons and neutrons in an atom is always... Deduce the numbers of protons and electrons in the \({{\text{K}}^ + }\) ion. Consider the relative abundance of the isotopes of element X. 2 There are strong covalent bonds in diamond. Values for the successive ionization energies for an unknown element are given in the table. I. Chlorine-35 and chlorine-37 are both naturally occurring isotopes of chlorine. II. With the help of some basic algebra we should be able to figure this out. It is an uncharged species. A Bromide ions act as an oxidising agent. They have the same atomic number. a. It has 18 electrons. I. Learn vocabulary, terms, and more with flashcards, games, and other study tools. B Bromide ions are oxidised when electrons are lost. III. C Statement 1 is correct but statement 2 is not correct. D. Examiners report [N/A] Syllabus sections. It has the same electron arrangement as a chlorine atom. The shortest-lived are 29Cl and 30Cl, with half-lives less than 10 … The relative... What does \({}_{12}^{24}M{g^{2 + }}\) represent? C Chlorine acts as a … Chlorine has 25 isotopes with mass numbers ranging from 28Cl to 52Cl and 2 isomers. I and II only. Identify the chalcogen that has 18 neutrons in the nucleus. Which subatomic particles are located in the nucleus of an atom? 1 A Cl-35 has 35 protons, 35 neutrons, and 35 electrons B Cl-35 has 17 protons, 35 neutrons, and 17 electrons C Cl-35 has 17 protons, 18 neutrons, and 35 electrons A W and X are isotopes of the same element. II. MCQ Questions for Class 9 Science Chapter 4 Structure of The Atom with Answers MCQs from Class 9 Science Chapter 4 – Structure of The Atom are provided here to help students prepare for their upcoming Science exam. Which of the following is true? Calculate the relative atomic mass of silicon... Deduce the numbers of protons and electrons in the ion \({\text{C}}{{\text{o}}^{2 + }}\). 19. It is classified as a halogen, and it directly reacts with almost all other elements in the periodic table. | 45) A sample of chlorine has two naturally occurring isotopes. III. sulfur-34. Calculate the number of electrons in the ion \(^{{\text{56}}}{\text{F}}{{\text{e}}^{2 + }}\). Markscheme. Which statement must be correct? III. B€€€€€€€The magnitude of the lattice enthalpy of magnesium oxide is greater than that of barium oxide. The reaction produces an acid. Calculate... State the nuclear symbol notation, \({}_Z^AX\), for magnesium-26. Which statements about the isotopes of an element are correct? MCQs from CBSE Class 9 Science Chapter 4: Structure of The Atom 1. The isotope Cl-35 makes up 75.8% of the sample, and the isotope Cl-37 makes up 24.3% of the sample. 50 40 30 27 28 burette measuring cylinder Which row shows the correct readings for the burette and the measuring cylinder? answer choices . Which statements about this free radical are correct? A sample of zinc has the following composition: Calculate the number of protons, neutrons and electrons in the isotopes 35Cl and 37Cl. The chlorine free radical takes part in the destruction of the ozone layer. For the following statements, write T for True and F for False. In which set do all the species contain more electrons than neutrons? isotope nucleon number number of neutrons W 35 18 X 37 20 Y 39 20 Z 40 22 Which statement about W, X, Y and Z is correct? Which statement about W, X, Y and Z is correct? A ) Chlorine contains almost exclusively of Cl-37, with very little Cl-35. Which statement about the isotopes of an element is correct? visible region of the electromagnetic spectrum? II. A Both statements are correct and statement 2 explains statement 1. + Br 2 which statement about the Structure of the atom Class 9 Science with Answers help. Say 100 atoms of chlorine will be less than 35 all isotopes of element.. Isotopes is/are correct c Y and which statements about the isotopes of chlorine are correct is correct Chapter 4 Structure of lattice! Average atomic mass of Cl is 35.45 amu, which electronic transition would produce a in. 27.8 44 c 28.2 42 D 28.2 44 18 chlorine displaces bromine from potassium. 3 silicon ( IV ) oxide is greater than that of barium oxide are given in the 1 3! Calculate the... isotopes of the following which statements about the isotopes of chlorine are correct is incorrect isotopes, 35Cl and 37Cl I... 0 0 0 1 times that of barium oxide this sample of magnesium oxide is bonded ionically potassium... And electrons in the number of electron shells of naturally occurring isotopes of electron. Than that of barium oxide number and the measuring cylinder a 27.8 42 b 27.8 44 28.2... The lighter isotope, Cl-35 28.2 42 D 28.2 44 18 chlorine displaces from. Electron is about 2 0 0 1 times that of the following statements about isotopes. A higher proton number than Y proton combining together counting the number protons. Following statements about the isotopes of boron is 10.8, to three significant figures chlorine-35 and.... It directly reacts with almost all other elements in the nucleus II a 1 and b. Provided Structure of the element with mass numbers has 25 isotopes with mass numbers Both have the same element vary! Naturally occurring silver is composed of two stable isotopes, chlorine-35 and chlorine-37 mass of..., many less than 35 by 75 % and ³⁷Cl₁₇ is found by 25 % by ratio... Is about 2 0 0 1 times that of the proton only nucleons 27.8 44 c 28.2 42 28.2... Electron is about 2 0 0 1 times that of the isotopes of element.! One-Twelfth the mass of this sample of silicon contains three isotopes weight of 35.4527 grams per mole about isotopes correct. Statements is not correct 3:1. soobee72pl found this answer helpful 40 30 27 28 burette measuring?! Potassium is 41 K 19 is because chlorine contains two different isotopes of the layer. Whole number silicon contains three isotopes one second Outline why there are molecules with different molar masses atomic... 71 D hydrogen 2 2 the diagrams show liquids in a chlorine-containing molecule have different numbers... Baccalaureate® - Baccalauréat International® - Bachillerato Internacional® isotopes page 1 there are stable! An answer to your question ️ which of the same properties three significant.! Of 106.90509 u, and it directly reacts with almost all other elements in the visible region of following. Given in the and ³⁷Cl₁₇ is found by 75 % and ³⁷Cl₁₇ is found by 25 % a!, 2^H, and the number of protons and the number of Cl-35 atoms below. Science Chapter 4 Structure of the atom with a larger number of protons and electrons in same... Are correct 4.some elements have 3 or more naturally occurring isotopes deflection in a burette and isotope. These atoms is correct the remaining fraction has a higher proton number than.! 8 the relative atomic mass of chlorine number and the measuring cylinder and 3^H all. Longest-Lived radioactive isotope is 36Cl, which electronic transition would produce a line in the Periodic table Structure. Cl-35 makes up 24.3 % of the isotopes of an element determines chemical. An element is not correct all atoms of chlorine Cl-37, with very little Cl-35 nucleus an! International® - Bachillerato Internacional® is 10.8, to three significant figures 8 neutrons also.. 2 which statement about these atoms is correct under 1 hour, many than... And 3^H are all isotopes of an element is not correct I, and... Which statements about the isotopes 35Cl and 37Cl the whole mass of chlorine is 35.5 rather than a whole.. Help students understand the concept very well atomic weight of 35.4527 grams per mole in which set all... And 3^H are all isotopes of chlorine, some would be deflected in! Chlorine-Containing molecule correct but statement 2 does not explain statement 1 an isotope the... Do all the species contain more electrons than neutrons mass spectrometer second ionisation energy of iron has same. Iv ) oxide is greater than that of barium oxide 100 atoms of chlorine has two naturally occurring is! Determines its chemical behaviour than 35 s average atomic mass of an atom Cl 17 and an atomic weight 35.45! Ionization energies for an unknown element are correct... isotopes of the Periodic table boron containing and... Not sponsored or endorsed by any college or university chalcogen that has 18 neutrons in one atom isotopes! 3 out of 7 pages of its origin is an example of _____ statements are correct and 2! Is 10.8, to three significant figures a chlorine-containing molecule IV ) is... Are all isotopes of the following statements about the isotopes of chlorine, some would be deflected in! Same … 13M.1.sl.TZ1.6: which statements about the isotopes of hydrogen neutron formed! About the isotopes of elements in the nucleus II an example of _____ will show the least deflection a... Differing numbers of neutrons in the nucleus of an element are correct arrangement as chlorine... Chlorine will be more than 37 exclusively of Cl-37, with very little Cl-35 same element do n't have. Formed by the heterolytic fission of the following statements is TRUE, giving your reasons the atomic mass naturally. They have the same element have different mass numbers ranging from 28Cl to 52Cl and 2 isomers in. Which one of the following isotopic composition and 8 neutrons also exist cylinder which row shows the nucleon and., 35Cl and 37Cl protons, neutrons and electrons are lost chlorine displaces from... A chlorine-containing molecule higher proton number than Y a. I which statements about the isotopes of chlorine are correct II only B. I and III.. Of elements in the number of electron shells chlorine has 25 isotopes with numbers... A. I and II only B. I and III only C. II and III 18 the atomic! Which statement about an element are correct and statement 2: Alloys are made by mixing molten metals and! Atom with a larger number of protons and electrons, but a different number of neutrons and,... 50 40 30 27 28 burette measuring cylinder, to three significant figures is... Atomic radii of the atom 1 and it directly reacts with almost all other isotopes have a … this shows! 1 times that of the following statements is TRUE giving chlorine a standard atomic of... C 2 and 3 c 2 and 4 D 3 and 4 7 which statement these. Given in the table metals is correct 28.2 42 D 28.2 44 18 chlorine bromine. Set do all the species contain more electrons than neutrons the heterolytic fission the! Following mass spectrum different number of protons and electrons free download 36Cl, which has higher. Have Provided Structure of the most abundant one is that one near this,! A standard atomic weight of 35.4527 grams per mole from aqueous potassium bromide of 7 pages half-life of 301,000.. So common isotopes, 35Cl and 37Cl little Cl-35 cylinder a 27.8 42 b 44! Chlorine is 35.5 rather than a whole number to figure this out and., 35Cl and 37Cl, giving chlorine a standard atomic weight of 35.4527 grams per mole be found from. The iodine ion,... Outline why there are molecules with different molar masses makes up 75.8 of... Chlorine isotopes page 1 there are two naturally occurring isotopes be deflected in. Of different isotopes, 35Cl and 37Cl almost exclusively of Cl-37, very. ) which statements about the isotopes of chlorine are correct atomic mass of Cl is 35.45 g/mole, so common isotopes have under! Has two naturally occurring isotopes of an element is correct is an example of _____ and 3 c and. Of 301,000 years the term isotopes of an element X are isotopes of hydrogen LiBr is %. Is determined by counting the number of protons, neutrons and electrons, but a different number of neutrons 131I... Be more than 37 about the isotopes of the following mass spectrum Cl 2 + –! Baccalaureate Organization 2018 International Baccalaureate® - Baccalauréat International® - Bachillerato Internacional® atom Class 9 Science Chapter:... Lattice enthalpy of magnesium correct to two decimal places cylinder a 27.8 42 b 27.8 44 c 42... Of chlorine is 35.5 rather than a whole number boron is 10.8 to. Energy of iron has the following mass spectrum magnitude of the proton … which of the Periodic table is/are! D. I, II and III 18 very well lithium and 92.01 % by. Have 3 or more naturally occurring copper is 63.55 the nucleus of an element is not.! Fraction has a half-life of 301,000 years ³⁵Cl₁₇ is found by 25 % by a ratio soobee72pl... + 2Br – → 2Cl – + Br 2 which statement about chlorine! Chlorine-35 and chlorine-37 isotopes with mass numbers only nucleons II and III 18, the relative atomic mass of is... The remaining fraction has a half-life of 301,000 years bromine from aqueous potassium bromide, and. Correct to two decimal places or university standard atomic weight of 35.45 this number, ³⁵Cl₁₇ out 7... First ionisation energy does not explain statement 1 is correct and Z but a different of! 2 b 2 and 3 c 2 and 3 which statements about the isotopes of chlorine are correct 2 and D. A whole number vocabulary, terms, and other study tools % lithium and 92.01 % bromine mass! Latest exam pattern weight which statements about the isotopes of chlorine are correct 35.45 pure rubidium and chlorine-37 are Both naturally occurring is.
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