Isotopes — Paper 2 · IGCSE Chemistry (9-1) 0971

5 Chlorine exists as two common isotopes, 35Cl and 37Cl. Information about these two isotopes is shown. number of number of number of protons neutrons electron shells 35Cl 17 18 3 37Cl 17 20 3 Which statement explains why the two isotopes are of the same element? A Both have the same number of electron shells. B Both have the same number of protons. C Both have 7 outer shell electrons. D 37Cl has 2 more neutrons than 35Cl.

1 marks

Answer: B

This question in 0971/21 May/June 2018

3 How many neutrons are present in the atom 45 X ? 21 A 21 B 24 C 45 D 66

1 marks

Answer: B

This question in 0971/22 Oct/Nov 2018

4 Two naturally occurring isotopes of oxygen are 16O and 17O. Which statement is correct? A Both isotopes react with iron to form rust. B Neither isotope reacts with iron to form rust. C Only 16O reacts with iron to form rust. D Only 17O reacts with iron to form rust.

1 marks

Answer: A

This question in 0971/22 Oct/Nov 2018

4 Which statement about an atom of fluorine, 19 9 , is correct? F A It contains more protons than neutrons. B It contains a total of 28 protons, neutrons and electrons. C Its isotopes contain different numbers of protons. D Its nucleus contains 9 neutrons.

1 marks

Answer: B

This question in 0971/21 May/June 2019

6 Rubidium has two isotopes, 85 Rb and 87 Rb . 37 37 Which statement explains why both isotopes have the same chemical properties? A They have the same number of protons. B They have the same number of outer shell electrons. C They have different numbers of neutrons. D They have different mass numbers.

1 marks

Answer: B

This question in 0971/22 Oct/Nov 2019

4 The atomic number and nucleon number of a potassium atom are shown. potassium atom atomic number 19 nucleon number 39 How many protons, neutrons and electrons are in a potassium ion, K+? protons neutrons electrons A 19 20 18 B 19 20 20 C 20 19 18 D 20 19 19

1 marks

Answer: A

This question in 0971/21 May/June 2020

3 Which statement about isotopes is correct? A They have different proton numbers. B They have different chemical properties. C They have the same nucleon number. D They have the same number of electrons in their outer shell.

1 marks

Answer: D

This question in 0971/22 Oct/Nov 2020

8 Some information about particles P, Q, R and S is shown. nucleon number of number of number neutrons electrons P 12 6 6 Q 24 12 10 R 16 8 10 S 14 8 6 Which two particles are isotopes of the same element? A P and Q B P and S C Q and R D R and S

1 marks

Answer: B

This question in 0971/22 May/June 2021

4 How many protons, neutrons and electrons are there in one atom of the isotope 27 13Al ? protons neutrons electrons A 13 13 13 B 13 14 13 C 14 13 13 D 14 14 13

1 marks

Answer: B

This question in 0971/22 Oct/Nov 2021

3 The numbers of protons and neutrons and the electronic structures of four particles, W, X, Y and Z, are shown. number of number of electronic protons neutrons structure W 8 8 2,8 X 8 10 2,6 Y 8 8 2,6 Z 10 8 2,8 Which particles have the same chemical properties? A W and Y B W and Z C X and Y D X and Z

1 marks

Answer: C

This question in 0971/21 May/June 2022

4 X and Y are two different elements. X and Y have the same number of nucleons. Which statement about X and Y is correct? A They have the same physical properties. B Their atoms have the same number of electrons. C They are in different groups of the Periodic Table. D They have different relative masses.

1 marks

Answer: C

This question in 0971/22 May/June 2022

26 The number of protons and the number of neutrons in the atoms of elements X, Y and Z are shown. number of number of protons neutrons X 6 6 Y 7 6 Z 8 10 Which statement about the elements is correct? A X and Y are isotopes of the same element. B Z forms an ion with a +2 charge. C X and Z react together to form an ionic compound. D X, Y and Z are non-metals.

1 marks

Answer: D

This question in 0971/22 May/June 2022

4 Which statements about isotopes of the same element are correct? 1 They are atoms which have the same chemical properties because they have the same number of electrons in their outer shell. 2 They are atoms which have the same number of electrons and neutrons but different numbers of protons. 3 They are atoms which have the same number of electrons and protons but different numbers of neutrons. A 1 and 2 B 1 and 3 C 2 only D 3 only

1 marks

Answer: B

This question in 0971/22 Oct/Nov 2022

3 The atomic structures of four particles, W, X, Y and Z, are shown. electrons neutrons protons W 2 2 2 X 2 2 3 Y 2 3 2 Z 3 2 3 Which particles are isotopes of the same element? A W and X B W and Y C X and Y D X and Z

1 marks

Answer: B

This question in 0971/21 May/June 2023

4 Which statement explains why isotopes of the same element have the same chemical properties? A They have the same number of outer shell electrons. B They have the same number of neutrons. C They have different numbers of protons. D They have different mass numbers.

1 marks

Answer: A

This question in 0971/21 May/June 2023

2 An atom of element X contains: ● 5 protons ● 6 neutrons ● 5 electrons. Which statements about element X are correct? 1 X has an atomic number of 6. 2 X has a nucleon number of 11. 3 X is in Group II of the Periodic Table. 4 X is in the second period of the Periodic Table. A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: D

This question in 0971/22 May/June 2023

4 The percentage abundances of three isotopes in a sample of neon are shown. percentage isotope abundance / % 20 Ne 90.48 10 21 Ne 0.27 10 22 Ne 9.25 10 What is the relative atomic mass, Ar, of this sample of neon? A 10.19 B 20.19 C 21.00 D 30.19

1 marks

Answer: B

This question in 0971/22 Oct/Nov 2023

6 Which statement explains why isotopes of the same element have the same chemical properties? A They have different numbers of protons in their nucleus. B They have different numbers of neutrons in their nucleus. C They have the same electronic configuration. D They have the same number of electrons as protons.

1 marks

Answer: C

This question in 0971/21 May/June 2024

3 Which statements about isotopes are correct? 1 Isotopes are atoms of different elements with the same number of protons. 2 Isotopes of the same element have the same chemical properties. 3 Isotopes are atoms with the same relative atomic mass. 4 Isotopes of the same element have the same electronic configuration. A 1 and 2 B 1 and 3 C 2 and 4 D 3 and 4

1 marks

Answer: C

This question in 0971/22 May/June 2024

3 Rubidium has two isotopes, 85 Rb and 87 Rb. 37 37 Which statement explains why both isotopes have the same chemical properties? A They have the same number of protons. B They have the same electronic configuration. C They have different numbers of neutrons. D They have different mass numbers.

1 marks

Answer: B

This question in 0971/22 Oct/Nov 2024

3 Which row gives the number of protons, electrons and neutrons in an atom of zinc? protons electrons neutrons A 30 30 35 B 30 35 35 C 35 30 30 D 35 35 30

1 marks

Answer: A

This question in 0971/22 May/June 2025

5 A sample of element Q has two isotopes. Their relative masses and abundances are shown. relative mass abundance of isotope / % 238 66 244 34 What is the relative atomic mass of this sample of Q to three significant figures? A 240 B 241 C 242 D 243

1 marks

Answer: A

This question in 0971/22 May/June 2025

6 Which two values are used to calculate the relative atomic mass of a sample of boron? value 1 value 2 A the total number the total number of boron isotopes of boron atoms B the relative abundance of each the relative mass boron isotope in the sample of each boron isotope C the relative abundance of each the total number boron isotope in the sample of boron atoms D the total number the relative mass of boron isotopes of each boron isotope

1 marks

Answer: B

This question in 0971/22 Oct/Nov 2025