Isotopes — Paper 1 · A Level Chemistry 9701

31 The relative molecular mass of a molecule of chlorine is 72. Which properties of the atoms in this molecule are the same? 1 radius 2 nucleon number 3 relative isotopic mass

1 marks

Answer: D

This question in 9701/11 Oct/Nov 2005

2 A sample of chlorine containing isotopes of mass numbers 35 and 37 was analysed in a mass-spectrometer. How many peaks corresponding to Cl were recorded? + 2 A 2 B 3 C 4 D 5

1 marks

Answer: B

This question in 9701/11 May/June 2006

4 A radioactive isotope of thallium, 201 81 Tl, is used to assess damage in heart muscles after a heart attack. Which statement about 201 81 Tl is correct? A This isotope has a nucleon number of 120. B The number of electrons in one atom of this isotope is 81. C The number of neutrons in one atom of this isotope is 201. D 201 X is an isotope of 201 81 Tl. 82

1 marks

Answer: B

This question in 9701/11 May/June 2006

38 Deuterium, D, is the H 2 isotope of hydrogen. DBr has the same chemical properties as HBr. 1 Which compounds could be made by the reaction of DBr with another compound in a single reaction? Br D 1 2 CHBr2CHDBr OD 3 CH3CH Br

1 marks

Answer: B

This question in 9701/11 May/June 2006

37 Which mixtures, on heating, produce the gas ND3? [D = H 2 , an isotope of hydrogen] 1 1 CaO(s) and ND4Cl(s) 2 CH3CN and NaOD in D2O 3 NDH3Cl and NaOD in D2O

1 marks

Answer: B

This question in 9701/11 Oct/Nov 2007

3 Skin cancer can be treated using a radioactive isotope of phosphorus, 32 P . A compound 15 containing the phosphide ion 32 15P −, wrapped in a plastic sheet, is strapped to the affected 3 area. What is the composition of the phosphide ion, 32 15P −? 3 protons neutrons electrons A 15 17 18 B 15 17 32 C 17 15 17 D 32 17 15

1 marks

Answer: A

This question in 9701/11 May/June 2008

31 On a scale in which the mass of a 12C atom is 12 the relative molecular mass of a particular sample of chlorine is 72. Which properties of the atoms in this sample are always the same? 1 radius 2 nucleon number 3 isotopic mass

1 marks

Answer: D

This question in 9701/11 May/June 2009

1 An element X consists of four isotopes. The mass spectrum of X is shown in the diagram. 100 80 relative 60 abundance % 40 20 0 90 91 92 93 94 m / e What is the relative atomic mass of X? A 91.00 B 91.30 C 91.75 D 92.00

1 marks

Answer: B

This question in 9701/11 Oct/Nov 2009

1 Helium, He, is the second element in the Periodic Table. Tritium is the isotope of hydrogen 3H. What is the same in an atom of 4He and an atom of 3H? A the number of electrons B the number of neutrons C the number of protons D the relative atomic mass

1 marks

Answer: B

This question in 9701/12 May/June 2011

9 John Dalton’s atomic theory, published in 1808, contained four predictions about atoms. Which of his predictions is still considered to be correct? A All atoms are very small in size. B All the atoms of a particular element have the same mass. C All the atoms of one element are different in mass from all the atoms of other elements. D No atom can be split into simpler parts.

1 marks

Answer: A

This question in 9701/11 Oct/Nov 2012

32 Use of the Data Booklet is relevant to this question. The isotope 99Tc is radioactive and has been found in lobsters and seaweed adjacent to nuclear fuel reprocessing plants. Which statements are correct about an atom of 99Tc? 1 It has 13 more neutrons than protons. 2 It has 43 protons. 3 It has 99 nucleons.

1 marks

Answer: A

This question in 9701/11 Oct/Nov 2012

9 John Dalton’s atomic theory, published in 1808, contained four predictions about atoms. Which of his predictions is still considered to be correct? A All atoms are very small in size. B All the atoms of a particular element have the same mass. C All the atoms of one element are different in mass from all the atoms of other elements. D No atom can be split into simpler parts.

1 marks

Answer: A

This question in 9701/12 Oct/Nov 2012

32 Use of the Data Booklet is relevant to this question. The isotope 99Tc is radioactive and has been found in lobsters and seaweed adjacent to nuclear fuel reprocessing plants. Which statements are correct about an atom of 99Tc? 1 It has 13 more neutrons than protons. 2 It has 43 protons. 3 It has 99 nucleons.

1 marks

Answer: A

This question in 9701/12 Oct/Nov 2012

32 The phosphide ion 31 P 3– and sulfide ion 32 S 2– have the same number of which sub-atomic 15 16 particles? 1 neutrons 2 electrons 3 protons

1 marks

Answer: B

This question in 9701/13 Oct/Nov 2012

5 In which species are the numbers of protons, neutrons and electrons all different? A 27 A l B 35 C l − C 16S 32 2 − D 39 K + 13 17 19

1 marks

Answer: D

This question in 9701/11 May/June 2013

3 Which ion has more electrons than protons and more protons than neutrons? [H = 1 1H ; D = 2 1 H ; O = 16 8 O] A D– B H3O+ C OD– D OH–

1 marks

Answer: D

This question in 9701/12 May/June 2013

31 X is a particle with 18 electrons and 20 neutrons. What could be the symbol of X? 1 38 Ar 18 2 40 20Ca 2 + 3 39 K + 19

1 marks

Answer: A

This question in 9701/11 Oct/Nov 2013

31 X is a particle with 18 electrons and 20 neutrons. What could be the symbol of X? 1 38 Ar 18 2 40 20Ca 2 + 3 39 K + 19

1 marks

Answer: A

This question in 9701/12 Oct/Nov 2013

31 The 1H3 + ion was first characterised by J. J. Thomson over a century ago. 6Li is a rare isotope of lithium which forms the 6Li+ ion. Which statements are correct? 1 Both ions contain the same number of protons. 2 Both ions contain the same number of electrons. 3 Both ions contain the same number of neutrons.

1 marks

Answer: B

This question in 9701/13 Oct/Nov 2013

31 In 2011 an international group of scientists agreed to add two new elements to the Periodic Table. Both elements had been made artificially and were called ununquadium (Uuq) and ununhexium (Uuh). Uuq Uuh proton number 114 116 nucleon number 289 292 Which statements about these elements are correct? 1 One atom of Uuh has one more neutron than one atom of Uuq. 2 One Uuq2– ion has the same number of electrons as one atom of Uuh. 3 One Uuh+ ion has the same number of electrons as one Uuq– ion.

1 marks

Answer: A

This question in 9701/13 May/June 2014

32 Which statements are correct when referring to the isotopes of a single element? 1 The isotopes have different masses. 2 The isotopes have different numbers of nucleons. 3 The isotopes have different chemical reactions.

1 marks

Answer: B

This question in 9701/13 Oct/Nov 2014

31 Use of the Data Booklet is relevant to this question. The isotope 99Tc is radioactive and has been found in lobsters and seaweed adjacent to nuclear fuel reprocessing plants. Which statements are correct about an atom of 99Tc? 1 It has 13 more neutrons than protons. 2 It has 43 protons. 3 It has 99 nucleons.

1 marks

Answer: A

This question in 9701/11 May/June 2015

1 Use of the Data Booklet is relevant to this question. In which option do all three particles have the same electronic configuration and the same number of neutrons? A 15N3– 16O2– 19F– B 18O2– 19F– 20Ne C 19F– 20Ne 23Na+ D 22Ne 23Na 24Mg2+

1 marks

Answer: B

This question in 9701/12 May/June 2015

31 Use of the Data Booklet is relevant to this question. Which statements about the phosphide ion, 31P3–, and the chloride ion, 35Cl –, are correct? 1 They have the same number of electrons. 2 They have the same number of neutrons. 3 They have the same number of protons.

1 marks

Answer: D

This question in 9701/12 May/June 2015

40 Monopotassium citrate is used as an emulsifying agent in powdered milk and in powdered soups. It may be represented by the formula shown. CH2CO2H HO C CO2 K+ – CH2CO2H monopotassium citrate Which statements about monopotassium citrate are correct? 1 It does not have a chiral carbon atom. 2 It can act as a dibasic acid. 3 It reacts with NaHCO3 to give CO2.

1 marks

Answer: A

This question in 9701/12 May/June 2015

31 The relative molecular mass, Mr, of a particular sample of chlorine is 72.0. Which properties of the atoms in this sample will be the same for all of the atoms? 1 radius 2 nucleon number 3 isotopic mass

1 marks

This question in 9701/12 Oct/Nov 2015

4 When nuclear reactions take place, the elements produced are different from the elements that reacted. Nuclear equations, such as the one below, are used to represent the changes that occur. 235 U + n 1 0 → 144 Ba + 89 Kr + 3 n 0 1 92 56 36 The nucleon (mass) number total is constant at 236 and the proton number total is constant at 92. In another nuclear reaction, uranium-238 is reacted with deuterium atoms, 2 H. An isotope of a 1 new element, J, is formed as well as two neutrons. 238 U + H 2 → J + 2 n 0 1 92 1 What is isotope J? A 238Np B 238Pu C 240Np D 240Pu

1 marks

Answer: A

This question in 9701/11 May/June 2016

31 X is a particle with 18 electrons and 20 neutrons. What could be the symbol of X? 1 38 Ar 18 2 40 20Ca 2 + 3 39 K + 19

1 marks

Answer: A

This question in 9701/11 May/June 2016

1 In which pair do the atoms contain the same number of neutrons? A 11B and 12C B 7Li and 9Be C 24Mg and 28Si D 14N and 16O

1 marks

Answer: A

This question in 9701/12 Oct/Nov 2017

31 In 2011 an international group of scientists agreed to add two new elements to the Periodic Table. Both elements had been made artificially and are called flerovium, Fl, and livermorium, Lv. Fl Lv proton number 114 116 nucleon number 289 292 From the information about atoms in the table, which statements are correct? 1 One atom of Lv has one more neutron than one atom of Fl. 2 One Fl 2– ion has the same number of electrons as one atom of Lv. 3 One Lv+ ion has the same number of electrons as one Fl – ion.

1 marks

Answer: A

This question in 9701/12 Oct/Nov 2017

32 In which pairs do both species have the same number of electrons? 1 35Cl and 37Cl 2 35Cl – and 40Ar 3 40Ar and 40K+

1 marks

Answer: A

This question in 9701/12 May/June 2018

2 Beams of charged particles are deflected by an electrical field. The angle of deflection of a particle is proportional to its charge / mass ratio. In an experiment protons are deflected by an angle of +15°. In another experiment under identical conditions 2H– ions are deflected by an angle of Y°. What is the value of Y? A –30.0 B –7.5 C +7.5 D +30.0

1 marks

Answer: B

This question in 9701/12 Oct/Nov 2018

2 A sample of element X is analysed using mass spectrometry. The mass spectrum obtained is shown. 56% 41% % abundance 3% 112 113 114 115 116 m / e What is the relative atomic mass of this sample of element X? A 113.7 B 114.0 C 114.2 D 114.4

1 marks

Answer: D

This question in 9701/11 May/June 2019

31 An atom of calcium-48 can form a 2+ ion. Which statements about this ion are correct? 1 It has 20 protons. 2 It has 28 neutrons. 3 It has 22 electrons.

1 marks

Answer: B

This question in 9701/11 May/June 2019

2 Oxygen has three stable isotopes, 16O, 17O and 18O. All three isotopes are present in a sample of oxygen gas, O2, which was analysed using a mass spectrometer. How many peaks associated with the O2 + ion would be expected? A 3 B 5 C 6 D 9

1 marks

Answer: B

This question in 9701/12 May/June 2019

32 Which statements about an atom of 99Tc are correct? 1 It has 13 fewer protons than neutrons. 2 It forms 99Tc2+ which has 45 electrons. 3 It has 56 nucleons.

1 marks

Answer: D

This question in 9701/12 May/June 2019

31 Which deductions about the 209 Bi atom are correct? 83 1 It has 83 electrons. 2 It has 126 nucleons. 3 It has 83 neutrons.

1 marks

Answer: D

This question in 9701/13 May/June 2019

32 Which statements are correct when referring to the two common isotopes of chlorine? 1 The isotopes have different masses. 2 The isotopes have different numbers of nucleons. 3 The isotopes have the same chemical reactions.

1 marks

Answer: A

This question in 9701/13 May/June 2019

31 A particular atom of germanium, Ge, has a nucleon number of 70. Which statements about a 70 Ge atom are correct? 32 1 It has the same number of electrons as a 79 34Se 2 + ion. 2 It has the same number of neutrons as an atom of 68 30Zn. 3 It has half as many protons as an atom of 160 64Gd.

1 marks

Answer: A

This question in 9701/11 Oct/Nov 2019

31 A particular atom of germanium, Ge, has a nucleon number of 70. Which statements about a 70 Ge atom are correct? 32 1 It has the same number of electrons as a 79 34Se 2 + ion. 2 It has the same number of neutrons as an atom of 68 30Zn. 3 It has half as many protons as an atom of 160 64Gd.

1 marks

Answer: A

This question in 9701/13 Oct/Nov 2019

34 Sodium and fluorine are both reactive elements. Two atoms are described. F Na atomic number 9 11 nucleon number 19 23 Which statements about these two atoms, and the ions they can form, are correct? 1 One Na atom has two more protons than one F– ion. 2 One Na atom has two more neutrons than one F atom. 3 One Na+ ion has the same number of electrons as one F– ion.

1 marks

Answer: A

This question in 9701/12 May/June 2020

7 The element sulfur produces a mass spectrum with the following peaks. m / e value relative of peak abundance 32 95.02 33 0.76 34 4.20 36 0.02 Which relative atomic mass of sulfur can be calculated from these data, given to four significant figures? A 32.07 B 32.08 C 32.09 D 32.10

1 marks

Answer: C

This question in 9701/13 May/June 2020

3 A single 32P nucleus can be produced when a single 32S nucleus joins with particle X. In the process a proton is emitted. What is particle X? A a deuteron, 2 H  1 B an electron C a neutron D a proton

1 marks

Answer: C

This question in 9701/11 Oct/Nov 2020

31 The symbol for a phosphorus ion is 33 15P 3 − . The symbol for a potassium ion is 37 K + . 19 What do these two ions have in common? 1 the same number of electrons 2 the same number of neutrons 3 the same number of protons

1 marks

Answer: B

This question in 9701/12 Oct/Nov 2020

3 A single 32P nucleus can be produced when a single 32S nucleus joins with particle X. In the process a proton is emitted. What is particle X? A a deuteron, 2 H  1 B an electron C a neutron D a proton

1 marks

Answer: C

This question in 9701/13 Oct/Nov 2020

1 The table shows the numbers of protons, neutrons and electrons in four different particles, W, X, Y, and Z. number of number of number of protons neutrons electrons W 32 40 32 X 32 40 34 Y 32 42 32 Z 34 40 34 Which pair represents the atoms of two isotopes of the same element? A W and Y B W and Z C X and Y D X and Z

1 marks

Answer: A

This question in 9701/12 Feb/March 2021

3 Technetium (Tc) is a second row transition element that does not occur naturally on Earth. One of its isotopes has 56 neutrons. What is the nucleon number of this isotope? A 43 B 56 C 99 D 112

1 marks

Answer: C

This question in 9701/12 Oct/Nov 2021

1 The mass spectrum of a sample of neon is shown. The relative abundance of each peak is written in brackets above it. (100) relative abundance (8) (0.3) 20 21 22 mass charge What is the relative atomic mass, Ar, of this sample of neon? A 20.15 B 20.20 C 21.00 D 21.82

1 marks

Answer: A

This question in 9701/13 Oct/Nov 2021

39 A sample of sulfur consists mostly of 32S. It also contains 4.2% 34S and 2.8% 36S. No other isotopes of sulfur are present. What is the relative atomic mass, Ar, of this sample of sulfur? A 32.1 B 32.2 C 34.0 D 34.3

1 marks

Answer: B

This question in 9701/13 May/June 2022

3 In which species are the numbers of protons, neutrons and electrons all different? A 27 A l B 35 C l  C 16S 32 2  D 39 K  13 17 19

1 marks

Answer: D

This question in 9701/12 Oct/Nov 2022

12 Which atom contains four times as many neutrons as the atom? A B C D

1 marks

Answer: C

This question in 9701/12 Feb/March 2023

40 Oxygen has three stable isotopes, 16O, 17O and 18O. All three isotopes are present in a sample of oxygen gas, O2, which was analysed using a mass spectrometer. + ion would be expected? How many peaks associated with the O2 A 3 B 5 C 6 D 9

1 marks

Answer: B

This question in 9701/12 Oct/Nov 2023

1 Which species contains the same number of neutrons as 14 C and the same number of electrons 6 as 23 Na  ? 11 A 17 F B 16 7N 3 – C 20 Ne D 16 8O 2 – 9 10

1 marks

Answer: D

This question in 9701/12 Feb/March 2024

4 Which statement about 131 53 is correct? I A A negative ion of 131 53 contains 53 neutrons and 52 electrons. I B A negative ion of 131 53 contains 53 neutrons and 54 electrons. I C A negative ion of 131 53 contains 78 neutrons and 52 electrons. I D A negative ion of 131 53 contains 78 neutrons and 54 electrons. I

1 marks

Answer: D

This question in 9701/11 May/June 2024

40 The relative atomic mass of antimony is 121.76. Antimony has two isotopes. The mass numbers of the two isotopes differ by two. The isotope with the lower mass number is the more abundant. What is the percentage abundance of the isotope with the higher mass number? A 12% B 38% C 62% D 88%

1 marks

Answer: B

This question in 9701/11 May/June 2024

3 What is the total number of protons, neutrons and electrons present in an ammonium ion with a relative formula mass of 21? number number number of protons of neutrons of electrons A 11 10 10 B 10 11 11 C 10 11 10 D 11 10 11

1 marks

Answer: A

This question in 9701/13 May/June 2024

4 An ion with a charge of 2– contains 10 electrons and 14 neutrons. What is its nucleon number? A 14 B 22 C 24 D 26

1 marks

Answer: B

This question in 9701/12 Feb/March 2025

40 The mass spectrum of element Z is shown. 100 relative 50 intensity 0 30 35 40 45 50 55 60 65 70 75 80 m / e What is element Z? A arsenic B chlorine C gallium D tungsten

1 marks

Answer: B

This question in 9701/14 May/June 2025

40 A sample of magnesium contains the isotopes 24Mg, 25Mg and 26Mg only. The percentage abundance of 25Mg and 26Mg is the same. The relative atomic mass of magnesium in the sample is 24.3. What is the percentage abundance of 24Mg? A 10% B 20% C 60% D 80%

1 marks

Answer: D

This question in 9701/11 Oct/Nov 2025

40 A sample of magnesium contains the isotopes 24Mg, 25Mg and 26Mg only. The percentage abundance of 25Mg and 26Mg is the same. The relative atomic mass of magnesium in the sample is 24.3. What is the percentage abundance of 24Mg? A 10% B 20% C 60% D 80%

1 marks

Answer: D

This question in 9701/13 Oct/Nov 2025